001 · chemistry · easy
What is the chemical symbol for Hydrogen?
Chemistry & Biology
600 questions across easy, medium and hard — the two subjects the fluid archive doesn't cover. Pick an answer and the explanation appears straight away.
600 shown · 0 correct
002 · chemistry · easy
What is the chemical symbol for Helium?
003 · chemistry · easy
What is the chemical symbol for Lithium?
004 · chemistry · easy
What is the chemical symbol for Beryllium?
005 · chemistry · easy
What is the chemical symbol for Boron?
006 · chemistry · easy
What is the chemical symbol for Carbon?
007 · chemistry · easy
What is the chemical symbol for Nitrogen?
008 · chemistry · easy
What is the chemical symbol for Oxygen?
009 · chemistry · easy
What is the chemical symbol for Fluorine?
010 · chemistry · easy
What is the chemical symbol for Neon?
011 · chemistry · easy
What is the chemical symbol for Sodium?
012 · chemistry · easy
What is the chemical symbol for Magnesium?
013 · chemistry · easy
What is the chemical symbol for Aluminium?
014 · chemistry · easy
What is the chemical symbol for Silicon?
015 · chemistry · easy
What is the chemical symbol for Phosphorus?
016 · chemistry · easy
What is the chemical symbol for Sulfur?
017 · chemistry · easy
What is the chemical symbol for Chlorine?
018 · chemistry · easy
What is the chemical symbol for Argon?
019 · chemistry · easy
What is the chemical symbol for Potassium?
020 · chemistry · easy
What is the chemical symbol for Calcium?
021 · chemistry · easy
What is the chemical symbol for Scandium?
022 · chemistry · easy
What is the chemical symbol for Titanium?
023 · chemistry · easy
What is the chemical symbol for Vanadium?
024 · chemistry · easy
What is the chemical symbol for Chromium?
025 · chemistry · easy
What is the chemical symbol for Manganese?
026 · chemistry · easy
What is the chemical symbol for Iron?
027 · chemistry · easy
What is the chemical symbol for Cobalt?
028 · chemistry · easy
What is the chemical symbol for Nickel?
029 · chemistry · easy
What is the chemical symbol for Copper?
030 · chemistry · easy
What is the chemical symbol for Zinc?
031 · chemistry · easy
What is the chemical symbol for Gallium?
032 · chemistry · easy
What is the chemical symbol for Germanium?
033 · chemistry · easy
What is the chemical symbol for Arsenic?
034 · chemistry · easy
What is the chemical symbol for Selenium?
035 · chemistry · easy
What is the chemical symbol for Bromine?
036 · chemistry · easy
What is the chemical symbol for Krypton?
037 · chemistry · easy
What is the chemical symbol for Rubidium?
038 · chemistry · easy
What is the chemical symbol for Strontium?
039 · chemistry · easy
What is the chemical symbol for Silver?
040 · chemistry · easy
What is the chemical symbol for Cadmium?
041 · chemistry · easy
Which element has the symbol Na?
042 · chemistry · easy
Which element has the symbol Mg?
043 · chemistry · easy
Which element has the symbol Al?
044 · chemistry · easy
Which element has the symbol Si?
045 · chemistry · easy
Which element has the symbol P?
046 · chemistry · easy
Which element has the symbol S?
047 · chemistry · easy
Which element has the symbol Cl?
048 · chemistry · easy
Which element has the symbol Ar?
049 · chemistry · easy
Which element has the symbol K?
050 · chemistry · easy
Which element has the symbol Ca?
051 · chemistry · easy
Which element has the symbol Sc?
052 · chemistry · easy
Which element has the symbol Ti?
053 · chemistry · easy
Which element has the symbol V?
054 · chemistry · easy
Which element has the symbol Cr?
055 · chemistry · easy
Which element has the symbol Mn?
056 · chemistry · easy
Which element has the symbol Fe?
057 · chemistry · easy
Which element has the symbol Co?
058 · chemistry · easy
Which element has the symbol Ni?
059 · chemistry · easy
Which element has the symbol Cu?
060 · chemistry · easy
Which element has the symbol Zn?
061 · chemistry · easy
Which element has the symbol Ga?
062 · chemistry · easy
Which element has the symbol Ge?
063 · chemistry · easy
Which element has the symbol As?
064 · chemistry · easy
Which element has the symbol Se?
065 · chemistry · easy
Which element has the symbol Br?
066 · chemistry · easy
What is the chemical formula for water?
067 · chemistry · easy
What gas do humans breathe in to survive?
068 · chemistry · easy
What is the pH of a neutral solution at 25 °C?
069 · chemistry · easy
What is the most abundant gas in Earth's atmosphere?
070 · chemistry · easy
What are the three common states of matter?
071 · chemistry · easy
Which particle in an atom carries a negative charge?
072 · chemistry · easy
Which particle has no electric charge?
073 · chemistry · easy
What is table salt chemically?
074 · chemistry · easy
What is the chemical formula for carbon dioxide?
075 · chemistry · easy
What does a pH below 7 indicate?
076 · chemistry · easy
Which metal is liquid at room temperature?
077 · chemistry · easy
What is the centre of an atom called?
078 · chemistry · easy
Which gas makes drinks fizzy?
079 · chemistry · easy
Which element is the main component of diamond?
080 · chemistry · easy
What is H2O2 commonly known as?
081 · chemistry · easy
What process turns a liquid into a gas?
082 · chemistry · easy
What process turns a gas into a liquid?
083 · chemistry · easy
What is the boiling point of water at sea level in °C?
084 · chemistry · easy
What is the freezing point of water in °C?
085 · chemistry · easy
Which acid is found in lemons?
086 · chemistry · easy
Which acid is the main component of vinegar?
087 · chemistry · easy
Rust forms when iron reacts with oxygen and what else?
088 · chemistry · easy
What is a substance made of only one type of atom called?
089 · chemistry · easy
What do you call a mixture where one substance dissolves in another?
090 · chemistry · easy
Which gas is produced when a metal reacts with an acid?
091 · chemistry · easy
What is the chemical symbol for gold?
092 · chemistry · easy
Which scientist created the modern periodic table?
093 · chemistry · easy
What is the lightest element?
094 · chemistry · easy
Which group of elements is almost completely unreactive?
095 · chemistry · easy
What is the chemical formula of methane?
096 · chemistry · easy
Baking soda is chemically known as?
097 · chemistry · easy
What colour does litmus paper turn in acid?
098 · chemistry · easy
What colour does litmus paper turn in a base?
099 · chemistry · easy
Which element is essential for strong bones and teeth?
100 · chemistry · easy
Which gas is used in balloons that float?
101 · chemistry · medium
What is the atomic number of Hydrogen (H)?
102 · chemistry · medium
What is the atomic number of Helium (He)?
103 · chemistry · medium
What is the atomic number of Lithium (Li)?
104 · chemistry · medium
What is the atomic number of Beryllium (Be)?
105 · chemistry · medium
What is the atomic number of Boron (B)?
106 · chemistry · medium
What is the atomic number of Carbon (C)?
107 · chemistry · medium
What is the atomic number of Nitrogen (N)?
108 · chemistry · medium
What is the atomic number of Oxygen (O)?
109 · chemistry · medium
What is the atomic number of Fluorine (F)?
110 · chemistry · medium
What is the atomic number of Neon (Ne)?
111 · chemistry · medium
What is the atomic number of Sodium (Na)?
112 · chemistry · medium
What is the atomic number of Magnesium (Mg)?
113 · chemistry · medium
What is the atomic number of Aluminium (Al)?
114 · chemistry · medium
What is the atomic number of Silicon (Si)?
115 · chemistry · medium
What is the atomic number of Phosphorus (P)?
116 · chemistry · medium
What is the atomic number of Sulfur (S)?
117 · chemistry · medium
What is the atomic number of Chlorine (Cl)?
118 · chemistry · medium
What is the atomic number of Argon (Ar)?
119 · chemistry · medium
What is the atomic number of Potassium (K)?
120 · chemistry · medium
What is the atomic number of Calcium (Ca)?
121 · chemistry · medium
What is the atomic number of Scandium (Sc)?
122 · chemistry · medium
What is the atomic number of Titanium (Ti)?
123 · chemistry · medium
What is the atomic number of Vanadium (V)?
124 · chemistry · medium
What is the atomic number of Chromium (Cr)?
125 · chemistry · medium
What is the atomic number of Manganese (Mn)?
126 · chemistry · medium
What is the atomic number of Iron (Fe)?
127 · chemistry · medium
What is the atomic number of Cobalt (Co)?
128 · chemistry · medium
What is the atomic number of Nickel (Ni)?
129 · chemistry · medium
What is the atomic number of Copper (Cu)?
130 · chemistry · medium
What is the atomic number of Zinc (Zn)?
131 · chemistry · medium
What is the atomic number of Gallium (Ga)?
132 · chemistry · medium
What is the atomic number of Germanium (Ge)?
133 · chemistry · medium
What is the atomic number of Arsenic (As)?
134 · chemistry · medium
What is the atomic number of Selenium (Se)?
135 · chemistry · medium
What is the atomic number of Bromine (Br)?
136 · chemistry · medium
What is the atomic number of Krypton (Kr)?
137 · chemistry · medium
What is the chemical formula of sulfuric acid?
138 · chemistry · medium
What is the chemical formula of ammonia?
139 · chemistry · medium
What is the chemical formula of glucose?
140 · chemistry · medium
What is the chemical formula of sodium hydroxide?
141 · chemistry · medium
What is the chemical formula of calcium carbonate?
142 · chemistry · medium
What is the chemical formula of nitric acid?
143 · chemistry · medium
What is the chemical formula of hydrochloric acid?
144 · chemistry · medium
What is the chemical formula of ethanol?
145 · chemistry · medium
What is the chemical formula of methane?
146 · chemistry · medium
What is the chemical formula of ozone?
147 · chemistry · medium
What is the chemical formula of potassium permanganate?
148 · chemistry · medium
What is the chemical formula of magnesium oxide?
149 · chemistry · medium
What is the chemical formula of sodium bicarbonate?
150 · chemistry · medium
What is the chemical formula of hydrogen peroxide?
151 · chemistry · medium
What is the chemical formula of ammonium chloride?
152 · chemistry · medium
What is the chemical formula of copper(II) sulfate?
153 · chemistry · medium
What is the chemical formula of silver nitrate?
154 · chemistry · medium
What is the chemical formula of carbon monoxide?
155 · chemistry · medium
What is the chemical formula of phosphoric acid?
156 · chemistry · medium
What is the chemical formula of calcium hydroxide?
157 · chemistry · medium
What is the chemical formula of iron(III) oxide?
158 · chemistry · medium
What is the chemical formula of sulfur dioxide?
159 · chemistry · medium
What is the chemical formula of acetic acid?
160 · chemistry · medium
What is the chemical formula of potassium nitrate?
161 · chemistry · medium
What is the chemical formula of zinc chloride?
162 · chemistry · medium
What is the chemical formula of benzene?
163 · chemistry · medium
What is the chemical formula of propane?
164 · chemistry · medium
What is the chemical formula of ethene?
165 · chemistry · medium
What is Avogadro's number (particles per mole)?
166 · chemistry · medium
What type of bond involves sharing electron pairs?
167 · chemistry · medium
What type of bond forms between a metal and a non-metal?
168 · chemistry · medium
What is the charge on a sulfate ion?
169 · chemistry · medium
What is the charge on an aluminium ion?
170 · chemistry · medium
Which subatomic particle determines the identity of an element?
171 · chemistry · medium
What is an isotope?
172 · chemistry · medium
What does a catalyst do in a reaction?
173 · chemistry · medium
An exothermic reaction does what?
174 · chemistry · medium
What is the mole ratio in 2H2 + O2 → 2H2O for H2 to O2?
175 · chemistry · medium
Which law states that mass is neither created nor destroyed?
176 · chemistry · medium
Which gas law relates pressure and volume at constant temperature?
177 · chemistry · medium
What is oxidation in terms of electrons?
178 · chemistry · medium
What is the strongest type of intermolecular force?
179 · chemistry · medium
What is the concentration unit mol/dm³ called?
180 · chemistry · medium
Which element family are Group 1 metals?
181 · chemistry · medium
Which family is Group 17?
182 · chemistry · medium
What is produced when an acid neutralises a base?
183 · chemistry · medium
What is the empirical formula of hydrogen peroxide (H2O2)?
184 · chemistry · medium
Which separation method separates liquids with different boiling points?
185 · chemistry · medium
What is the maximum number of electrons in the second shell?
186 · chemistry · medium
What is a solution with a pH of 13?
187 · chemistry · medium
What does a reversible reaction reach at equilibrium?
188 · chemistry · medium
Which element has the highest electronegativity?
189 · chemistry · medium
What kind of reaction is CH4 + 2O2 → CO2 + 2H2O?
190 · chemistry · medium
What is the molar volume of an ideal gas at STP (dm³)?
191 · chemistry · medium
What are alloys?
192 · chemistry · medium
Which process splits a compound using electricity?
193 · chemistry · medium
Which particle number equals atomic mass minus atomic number?
194 · chemistry · medium
What is the functional group of alcohols?
195 · chemistry · medium
What is the functional group of carboxylic acids?
196 · chemistry · medium
What type of reaction occurs between an alcohol and a carboxylic acid?
197 · chemistry · medium
Which gas turns limewater milky?
198 · chemistry · medium
Which test uses a glowing splint that relights?
199 · chemistry · medium
What is a saturated hydrocarbon called?
200 · chemistry · medium
What is the general formula of alkenes?
201 · chemistry · hard
What is the relative atomic mass of Hydrogen (H) to 2 decimal places?
202 · chemistry · hard
What is the relative atomic mass of Helium (He) to 2 decimal places?
203 · chemistry · hard
What is the relative atomic mass of Lithium (Li) to 2 decimal places?
204 · chemistry · hard
What is the relative atomic mass of Beryllium (Be) to 2 decimal places?
205 · chemistry · hard
What is the relative atomic mass of Boron (B) to 2 decimal places?
206 · chemistry · hard
What is the relative atomic mass of Carbon (C) to 2 decimal places?
207 · chemistry · hard
What is the relative atomic mass of Nitrogen (N) to 2 decimal places?
208 · chemistry · hard
What is the relative atomic mass of Oxygen (O) to 2 decimal places?
209 · chemistry · hard
What is the relative atomic mass of Fluorine (F) to 2 decimal places?
210 · chemistry · hard
What is the relative atomic mass of Neon (Ne) to 2 decimal places?
211 · chemistry · hard
What is the relative atomic mass of Sodium (Na) to 2 decimal places?
212 · chemistry · hard
What is the relative atomic mass of Magnesium (Mg) to 2 decimal places?
213 · chemistry · hard
What is the relative atomic mass of Aluminium (Al) to 2 decimal places?
214 · chemistry · hard
What is the relative atomic mass of Silicon (Si) to 2 decimal places?
215 · chemistry · hard
What is the relative atomic mass of Phosphorus (P) to 2 decimal places?
216 · chemistry · hard
What is the relative atomic mass of Sulfur (S) to 2 decimal places?
217 · chemistry · hard
What is the relative atomic mass of Chlorine (Cl) to 2 decimal places?
218 · chemistry · hard
What is the relative atomic mass of Argon (Ar) to 2 decimal places?
219 · chemistry · hard
What is the relative atomic mass of Potassium (K) to 2 decimal places?
220 · chemistry · hard
What is the relative atomic mass of Calcium (Ca) to 2 decimal places?
221 · chemistry · hard
What is the relative atomic mass of Scandium (Sc) to 2 decimal places?
222 · chemistry · hard
What is the relative atomic mass of Titanium (Ti) to 2 decimal places?
223 · chemistry · hard
What is the relative atomic mass of Vanadium (V) to 2 decimal places?
224 · chemistry · hard
What is the relative atomic mass of Chromium (Cr) to 2 decimal places?
225 · chemistry · hard
What is the relative atomic mass of Manganese (Mn) to 2 decimal places?
226 · chemistry · hard
What is the relative atomic mass of Iron (Fe) to 2 decimal places?
227 · chemistry · hard
What is the ground-state electron configuration of Carbon?
228 · chemistry · hard
What is the ground-state electron configuration of Oxygen?
229 · chemistry · hard
What is the ground-state electron configuration of Neon?
230 · chemistry · hard
What is the ground-state electron configuration of Sodium?
231 · chemistry · hard
What is the ground-state electron configuration of Chlorine?
232 · chemistry · hard
What is the ground-state electron configuration of Calcium?
233 · chemistry · hard
What is the ground-state electron configuration of Iron?
234 · chemistry · hard
What is the ground-state electron configuration of Copper?
235 · chemistry · hard
What is the ground-state electron configuration of Chromium?
236 · chemistry · hard
What is the ground-state electron configuration of Zinc?
237 · chemistry · hard
What is the ground-state electron configuration of Nitrogen?
238 · chemistry · hard
What is the ground-state electron configuration of Aluminium?
239 · chemistry · hard
What is the ground-state electron configuration of Silicon?
240 · chemistry · hard
What is the ground-state electron configuration of Argon?
241 · chemistry · hard
What is the ground-state electron configuration of Potassium?
242 · chemistry · hard
What is the ground-state electron configuration of Sulfur?
243 · chemistry · hard
What is the ground-state electron configuration of Magnesium?
244 · chemistry · hard
What is the ground-state electron configuration of Nickel?
245 · chemistry · hard
What is the oxidation state of Mn in KMnO4?
246 · chemistry · hard
What is the oxidation state of Cr in K2Cr2O7?
247 · chemistry · hard
What is the oxidation state of S in H2SO4?
248 · chemistry · hard
What is the pH of a 0.01 M HCl solution?
249 · chemistry · hard
What is the molar mass of glucose, C6H12O6 (g/mol)?
250 · chemistry · hard
What is the molar mass of sulfuric acid H2SO4 (g/mol)?
251 · chemistry · hard
What is the hybridisation of carbon in ethene?
252 · chemistry · hard
What is the hybridisation of carbon in methane?
253 · chemistry · hard
What is the bond angle in a tetrahedral molecule?
254 · chemistry · hard
What is the bond angle in water?
255 · chemistry · hard
What is the shape of ammonia (NH3)?
256 · chemistry · hard
What is the shape of SF6?
257 · chemistry · hard
What is the units of a first-order rate constant?
258 · chemistry · hard
Which equation relates rate constant to temperature?
259 · chemistry · hard
Which equation gives the pH of a buffer?
260 · chemistry · hard
What is ΔG at equilibrium?
261 · chemistry · hard
A reaction is spontaneous when ΔG is what?
262 · chemistry · hard
What is Hess's law about?
263 · chemistry · hard
Le Chatelier: increasing pressure favours which side?
264 · chemistry · hard
What is the conjugate base of H2SO4?
265 · chemistry · hard
What does the Nernst equation calculate?
266 · chemistry · hard
Which spectroscopic method identifies functional groups by bond vibration?
267 · chemistry · hard
What does ¹H NMR primarily probe?
268 · chemistry · hard
What type of isomerism does a chiral carbon produce?
269 · chemistry · hard
Which mechanism proceeds via a carbocation intermediate?
270 · chemistry · hard
What is the rate-determining step of an SN2 reaction?
271 · chemistry · hard
Which reagent oxidises a primary alcohol to a carboxylic acid?
272 · chemistry · hard
What is the common ion effect?
273 · chemistry · hard
What is Ksp?
274 · chemistry · hard
What is the second ionisation energy?
275 · chemistry · hard
What is lattice enthalpy?
276 · chemistry · hard
Which cycle relates lattice enthalpy to other enthalpy changes?
277 · chemistry · hard
What colour is the Cu²⁺(aq) ion?
278 · chemistry · hard
Why are transition metal complexes coloured?
279 · chemistry · hard
What is a ligand?
280 · chemistry · hard
What does the Beer-Lambert law relate?
281 · chemistry · hard
What is the molar mass of H2O in g/mol?
282 · chemistry · hard
What is the molar mass of CO2 in g/mol?
283 · chemistry · hard
What is the molar mass of NaCl in g/mol?
284 · chemistry · hard
What is the molar mass of NH3 in g/mol?
285 · chemistry · hard
What is the molar mass of CH4 in g/mol?
286 · chemistry · hard
What is the molar mass of CaCO3 in g/mol?
287 · chemistry · hard
What is the molar mass of NaOH in g/mol?
288 · chemistry · hard
What is the molar mass of HNO3 in g/mol?
289 · chemistry · hard
What is the molar mass of HCl in g/mol?
290 · chemistry · hard
What is the molar mass of C2H5OH in g/mol?
291 · chemistry · hard
What is the molar mass of O2 in g/mol?
292 · chemistry · hard
What is the molar mass of Fe2O3 in g/mol?
293 · chemistry · hard
What is the molar mass of MgO in g/mol?
294 · chemistry · hard
What is the molar mass of KOH in g/mol?
295 · chemistry · hard
What is the molar mass of C6H6 in g/mol?
296 · chemistry · hard
What is the molar mass of CuSO4 in g/mol?
297 · chemistry · hard
What is the entropy change sign when a solid sublimes?
298 · chemistry · hard
What is the half-life of a first-order reaction dependent on?
299 · chemistry · hard
Which orbital fills after 4s?
300 · chemistry · hard
What does the Pauli exclusion principle state?
301 · biology · easy
What is the main function of the mitochondrion?
302 · biology · easy
What is the main function of the ribosome?
303 · biology · easy
What is the main function of the nucleus?
304 · biology · easy
What is the main function of the chloroplast?
305 · biology · easy
What is the main function of the lysosome?
306 · biology · easy
What is the main function of the Golgi apparatus?
307 · biology · easy
What is the main function of the rough endoplasmic reticulum?
308 · biology · easy
What is the main function of the smooth endoplasmic reticulum?
309 · biology · easy
What is the main function of the cell membrane?
310 · biology · easy
What is the main function of the cell wall?
311 · biology · easy
What is the main function of the vacuole?
312 · biology · easy
What is the main function of the cytoplasm?
313 · biology · easy
What is the main function of the nucleolus?
314 · biology · easy
What is the main function of the centriole?
315 · biology · easy
What is the main function of the peroxisome?
316 · biology · easy
Which body system does the heart belong to?
317 · biology · easy
Which body system does the lungs belong to?
318 · biology · easy
Which body system does the stomach belong to?
319 · biology · easy
Which body system does the kidney belong to?
320 · biology · easy
Which body system does the brain belong to?
321 · biology · easy
Which body system does the skin belong to?
322 · biology · easy
Which body system does the femur belong to?
323 · biology · easy
Which body system does the biceps belong to?
324 · biology · easy
Which body system does the thyroid gland belong to?
325 · biology · easy
Which body system does the ovary belong to?
326 · biology · easy
Which body system does the spleen belong to?
327 · biology · easy
Which body system does the trachea belong to?
328 · biology · easy
Which body system does the small intestine belong to?
329 · biology · easy
Which body system does the spinal cord belong to?
330 · biology · easy
Which body system does the bladder belong to?
331 · biology · easy
What is the basic unit of life?
332 · biology · easy
What gas do plants absorb for photosynthesis?
333 · biology · easy
What green pigment lets plants capture light?
334 · biology · easy
Which blood cells carry oxygen?
335 · biology · easy
Which blood cells fight infection?
336 · biology · easy
What does DNA stand for?
337 · biology · easy
What is the largest organ of the human body?
338 · biology · easy
How many chambers does the human heart have?
339 · biology · easy
What is the powerhouse of the cell?
340 · biology · easy
Which organ pumps blood around the body?
341 · biology · easy
What do we call animals that eat only plants?
342 · biology · easy
Which process do plants use to make food?
343 · biology · easy
What is the human body's normal temperature in °C?
344 · biology · easy
Which vitamin does sunlight help produce in skin?
345 · biology · easy
What connects muscles to bones?
346 · biology · easy
What connects bone to bone?
347 · biology · easy
Which organ filters the blood to make urine?
348 · biology · easy
Where does most nutrient absorption occur?
349 · biology · easy
What is the study of living organisms called?
350 · biology · easy
What do we call the young stage of a frog?
351 · biology · easy
Which sense organ detects light?
352 · biology · easy
How many bones does an adult human have?
353 · biology · easy
Which gas do plants release during photosynthesis?
354 · biology · easy
What are the tiny air sacs in lungs called?
355 · biology · easy
What carries messages around the body electrically?
356 · biology · easy
Which part of the plant absorbs water?
357 · biology · easy
What is the green part of the plant where food is made?
358 · biology · easy
What do bees help plants do?
359 · biology · easy
Which animals are cold-blooded?
360 · biology · easy
What is the liquid part of blood called?
361 · biology · easy
Which animal group does the frog belong to?
362 · biology · easy
Which animal group does the snake belong to?
363 · biology · easy
Which animal group does the eagle belong to?
364 · biology · easy
Which animal group does the dolphin belong to?
365 · biology · easy
Which animal group does the shark belong to?
366 · biology · easy
Which animal group does the butterfly belong to?
367 · biology · easy
Which animal group does the crocodile belong to?
368 · biology · easy
Which animal group does the bat belong to?
369 · biology · easy
Which animal group does the penguin belong to?
370 · biology · easy
Which animal group does the salamander belong to?
371 · biology · easy
Which animal group does the salmon belong to?
372 · biology · easy
Which animal group does the ant belong to?
373 · biology · easy
Which sense is the eye responsible for?
374 · biology · easy
Which sense is the ear responsible for?
375 · biology · easy
Which sense is the nose responsible for?
376 · biology · easy
Which sense is the tongue responsible for?
377 · biology · easy
Which sense is the skin responsible for?
378 · biology · easy
What do we call animals that eat both plants and meat?
379 · biology · easy
Which part of a flower makes pollen?
380 · biology · easy
Which part of a flower receives pollen?
381 · biology · easy
What is the process of a seed starting to grow?
382 · biology · easy
Which nutrient group gives the body most quick energy?
383 · biology · easy
Which nutrient group is needed for growth and repair?
384 · biology · easy
Which food group helps prevent constipation?
385 · biology · easy
What do lungs exchange with the blood?
386 · biology · easy
Which muscle helps you breathe in below the lungs?
387 · biology · easy
What is the hard outer layer of a tooth called?
388 · biology · easy
Which organ stores bile?
389 · biology · easy
What are microbes that can cause disease called?
390 · biology · easy
Which of these is a virus-caused illness?
391 · biology · easy
What do we call an animal's natural home?
392 · biology · easy
Which insects make honey?
393 · biology · easy
What is a group of the same species living in one area called?
394 · biology · easy
What do we call an animal without a backbone?
395 · biology · easy
Which body part protects the brain?
396 · biology · easy
Which structures protect the lungs and heart?
397 · biology · easy
What does the pupil of the eye do?
398 · biology · easy
What is the yellow part of an egg called?
399 · biology · easy
Which vitamin helps prevent scurvy?
400 · biology · easy
What mineral is needed to make haemoglobin?
401 · biology · medium
Which gland or organ produces insulin?
402 · biology · medium
Which gland or organ produces adrenaline?
403 · biology · medium
Which gland or organ produces thyroxine?
404 · biology · medium
Which gland or organ produces growth hormone?
405 · biology · medium
Which gland or organ produces testosterone?
406 · biology · medium
Which gland or organ produces oestrogen?
407 · biology · medium
Which gland or organ produces melatonin?
408 · biology · medium
Which gland or organ produces cortisol?
409 · biology · medium
Which gland or organ produces glucagon?
410 · biology · medium
Which gland or organ produces antidiuretic hormone?
411 · biology · medium
Which gland or organ produces parathyroid hormone?
412 · biology · medium
Which gland or organ produces calcitonin?
413 · biology · medium
Which substrate does the enzyme amylase act on?
414 · biology · medium
Which substrate does the enzyme protease act on?
415 · biology · medium
Which substrate does the enzyme lipase act on?
416 · biology · medium
Which substrate does the enzyme lactase act on?
417 · biology · medium
Which substrate does the enzyme maltase act on?
418 · biology · medium
Which substrate does the enzyme pepsin act on?
419 · biology · medium
Which substrate does the enzyme cellulase act on?
420 · biology · medium
Which substrate does the enzyme sucrase act on?
421 · biology · medium
What is the process by which cells divide to make identical body cells?
422 · biology · medium
Which division halves the chromosome number to form gametes?
423 · biology · medium
How many chromosomes are in a human body cell?
424 · biology · medium
What is the movement of water across a semipermeable membrane called?
425 · biology · medium
Which transport process requires ATP?
426 · biology · medium
What is the balanced equation product of respiration in cells?
427 · biology · medium
What does anaerobic respiration produce in human muscles?
428 · biology · medium
What is a genotype?
429 · biology · medium
What is a phenotype?
430 · biology · medium
What are the base pairs in DNA?
431 · biology · medium
Which base replaces thymine in RNA?
432 · biology · medium
What is the shape of a DNA molecule?
433 · biology · medium
Which organ produces bile?
434 · biology · medium
Which vessel carries oxygenated blood away from the heart?
435 · biology · medium
Which vessels have valves to prevent backflow?
436 · biology · medium
What is homeostasis?
437 · biology · medium
Which part of the brain controls balance and coordination?
438 · biology · medium
Which part of the brain controls breathing and heart rate?
439 · biology · medium
What is the functional unit of the kidney?
440 · biology · medium
Which cells transmit nerve impulses?
441 · biology · medium
What is the gap between two neurons called?
442 · biology · medium
What is natural selection?
443 · biology · medium
What is a food chain's first level called?
444 · biology · medium
Which process moves water up a plant stem?
445 · biology · medium
Which tissue transports sugars in plants?
446 · biology · medium
Which tissue transports water in plants?
447 · biology · medium
What are stomata for?
448 · biology · medium
Which blood type is the universal donor?
449 · biology · medium
Which blood type is the universal recipient?
450 · biology · medium
What causes sickle cell anaemia?
451 · biology · medium
What is a vaccine made from?
452 · biology · medium
Which organism causes malaria?
453 · biology · medium
What is an ecosystem?
454 · biology · medium
What is a niche?
455 · biology · medium
What is binary fission?
456 · biology · medium
What is the role of the ribosome in translation?
457 · biology · medium
What are decomposers?
458 · biology · medium
What is the term for a species that no longer exists?
459 · biology · medium
Which type of immunity comes from antibodies made by your own body?
460 · biology · medium
What is the main nitrogenous waste of mammals?
461 · biology · medium
Which type of pathogen causes Tuberculosis?
462 · biology · medium
Which type of pathogen causes Influenza?
463 · biology · medium
Which type of pathogen causes Athlete's foot?
464 · biology · medium
Which type of pathogen causes Malaria?
465 · biology · medium
Which type of pathogen causes Cholera?
466 · biology · medium
Which type of pathogen causes Measles?
467 · biology · medium
Which type of pathogen causes Ringworm?
468 · biology · medium
Which type of pathogen causes COVID-19?
469 · biology · medium
Which type of pathogen causes Tetanus?
470 · biology · medium
Which type of pathogen causes Thrush?
471 · biology · medium
What is the correct order of taxonomic ranks from broadest?
472 · biology · medium
What is a species?
473 · biology · medium
Which structure controls what enters a bacterial cell?
474 · biology · medium
What is missing from prokaryotic cells?
475 · biology · medium
What does the term 'diploid' mean?
476 · biology · medium
What is a recessive allele?
477 · biology · medium
What determines a male human's sex chromosomally?
478 · biology · medium
Which structure in a sperm provides energy for swimming?
479 · biology · medium
What is the acrosome for?
480 · biology · medium
What is the role of the placenta?
481 · biology · medium
Which cells in the retina detect colour?
482 · biology · medium
What is the reflex arc's advantage?
483 · biology · medium
What is a limiting factor in photosynthesis?
484 · biology · medium
Which pyramid always narrows going up in an ecosystem?
485 · biology · medium
Roughly how much energy transfers between trophic levels?
486 · biology · medium
Which bacteria convert ammonia into nitrites and nitrates?
487 · biology · medium
What do nitrogen-fixing bacteria do?
488 · biology · medium
What is eutrophication caused by?
489 · biology · medium
What is the greenhouse effect mainly caused by?
490 · biology · medium
What is antibiotic resistance driven by?
491 · biology · medium
Why are antibiotics ineffective against viruses?
492 · biology · medium
What is the role of platelets?
493 · biology · medium
Which organ system removes CO2 from the body?
494 · biology · medium
What is peristalsis?
495 · biology · medium
What is the pH of the stomach roughly?
496 · biology · medium
What is the function of bile?
497 · biology · medium
What is glycogen?
498 · biology · medium
What happens to blood glucose when insulin is released?
499 · biology · medium
What is type 1 diabetes caused by?
500 · biology · medium
What is a mutation?
501 · biology · hard
Which amino acid is abbreviated Ala?
502 · biology · hard
Which amino acid is abbreviated Gly?
503 · biology · hard
Which amino acid is abbreviated Ser?
504 · biology · hard
Which amino acid is abbreviated Cys?
505 · biology · hard
Which amino acid is abbreviated Val?
506 · biology · hard
Which amino acid is abbreviated Leu?
507 · biology · hard
Which amino acid is abbreviated Ile?
508 · biology · hard
Which amino acid is abbreviated Met?
509 · biology · hard
Which amino acid is abbreviated Phe?
510 · biology · hard
Which amino acid is abbreviated Tyr?
511 · biology · hard
Which amino acid is abbreviated Trp?
512 · biology · hard
Which amino acid is abbreviated Lys?
513 · biology · hard
Which amino acid is abbreviated Arg?
514 · biology · hard
Which amino acid is abbreviated His?
515 · biology · hard
Which amino acid is abbreviated Asp?
516 · biology · hard
Which amino acid is abbreviated Glu?
517 · biology · hard
Which amino acid is abbreviated Asn?
518 · biology · hard
Which amino acid is abbreviated Gln?
519 · biology · hard
Which amino acid is abbreviated Pro?
520 · biology · hard
Which amino acid is abbreviated Thr?
521 · biology · hard
Where does glycolysis take place?
522 · biology · hard
Where does the Krebs cycle occur?
523 · biology · hard
How many ATP molecules does aerobic respiration of one glucose yield (approx.)?
524 · biology · hard
Where does the light-dependent reaction occur?
525 · biology · hard
Where does the Calvin cycle occur?
526 · biology · hard
Which enzyme fixes CO2 in the Calvin cycle?
527 · biology · hard
Which enzyme unwinds DNA during replication?
528 · biology · hard
Which enzyme joins Okazaki fragments?
529 · biology · hard
In which direction does DNA polymerase synthesise?
530 · biology · hard
How many codons code for amino acids or stop signals?
531 · biology · hard
What is the start codon?
532 · biology · hard
Which are the three stop codons?
533 · biology · hard
What is crossing over and when does it happen?
534 · biology · hard
What is the expected phenotype ratio of a monohybrid cross Aa × Aa?
535 · biology · hard
What is the dihybrid F2 ratio for independent genes?
536 · biology · hard
What is the Hardy-Weinberg equation?
537 · biology · hard
What is epistasis?
538 · biology · hard
What does the sodium-potassium pump move per ATP?
539 · biology · hard
What is the resting membrane potential of a typical neuron?
540 · biology · hard
What causes depolarisation in an action potential?
541 · biology · hard
What speeds up nerve conduction along myelinated axons?
542 · biology · hard
Which cells produce antibodies?
543 · biology · hard
What do cytotoxic T cells do?
544 · biology · hard
What is the Bohr effect?
545 · biology · hard
Which vessel carries deoxygenated blood to the lungs?
546 · biology · hard
Where is most water reabsorbed in the nephron?
547 · biology · hard
Which hormone increases water reabsorption in the collecting duct?
548 · biology · hard
What does aldosterone regulate?
549 · biology · hard
What is competitive inhibition?
550 · biology · hard
What does non-competitive inhibition do to Vmax?
551 · biology · hard
What is the induced fit model?
552 · biology · hard
What is the secondary structure of a protein?
553 · biology · hard
What holds together the quaternary structure of haemoglobin?
554 · biology · hard
Which bond links monosaccharides?
555 · biology · hard
Which bond links nucleotides in DNA?
556 · biology · hard
What is apoptosis?
557 · biology · hard
What is a stem cell's defining property?
558 · biology · hard
Which technique amplifies DNA in vitro?
559 · biology · hard
What separates DNA fragments by size?
560 · biology · hard
What are restriction enzymes used for?
561 · biology · hard
What is the endosymbiotic theory about?
562 · biology · hard
What is the scientific name of the human?
563 · biology · hard
What is the scientific name of the domestic dog?
564 · biology · hard
What is the scientific name of the house cat?
565 · biology · hard
What is the scientific name of the fruit fly?
566 · biology · hard
What is the scientific name of the common gut bacterium?
567 · biology · hard
What is the scientific name of the baker's yeast?
568 · biology · hard
What is the scientific name of the thale cress model plant?
569 · biology · hard
What is the scientific name of the african lion?
570 · biology · hard
What is the scientific name of the garden pea?
571 · biology · hard
What is the scientific name of the house mouse?
572 · biology · hard
What happens during prophase?
573 · biology · hard
What happens during metaphase?
574 · biology · hard
What happens during anaphase?
575 · biology · hard
What happens during telophase?
576 · biology · hard
What happens during interphase?
577 · biology · hard
What happens during cytokinesis?
578 · biology · hard
What is the electron transport chain's final electron acceptor in aerobic respiration?
579 · biology · hard
What is chemiosmosis?
580 · biology · hard
How many ATP does glycolysis net per glucose?
581 · biology · hard
What is the link reaction's product entering the Krebs cycle?
582 · biology · hard
What is photorespiration?
583 · biology · hard
What advantage do C4 plants have?
584 · biology · hard
What is transcription?
585 · biology · hard
What are introns?
586 · biology · hard
What does tRNA carry?
587 · biology · hard
What is the operon model an example of?
588 · biology · hard
What are telomeres?
589 · biology · hard
What is a proto-oncogene?
590 · biology · hard
What does p53 do?
591 · biology · hard
What is the fluid mosaic model about?
592 · biology · hard
What role does cholesterol play in membranes?
593 · biology · hard
What is water potential in a fully turgid plant cell?
594 · biology · hard
What is plasmolysis?
595 · biology · hard
What is a monoclonal antibody?
596 · biology · hard
What does the term 'antigenic variation' explain?
597 · biology · hard
What is the primary structure of a protein?
598 · biology · hard
What is the role of chaperone proteins?
599 · biology · hard
What is the cause of cystic fibrosis?
600 · biology · hard
Haemophilia is inherited in what pattern?