AQA A-level Biology — Practice Questions flashcards
6 of 70 questions free to study here · 8 topics · the whole deck is built into Willys
Multiple-choice practice questions, one best answer each, across all eight AQA A-level Biology topics, with calculations on magnification, diversity, Hardy–Weinberg, chi-squared, productivity and mark-release-recapture.
Practice deck · part of AQA A-level Biology · written against: AQA AS and A-level Biology (7401/7402) specification, version 1.6, July 2026 (eight topics). Updated 2026-10-10.
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The 6 sample questions as a list
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A solution gives no colour change when heated with Benedict's reagent. After boiling with dilute hydrochloric acid and neutralising, it gives a brick-red precipitate. Which sugar could it contain?
A) Glucose
B) Maltose
C) Fructose
D) SucroseD) SucroseBiological Molecules
Sucrose is a non-reducing sugar, so it reacts only after acid hydrolysis releases glucose and fructose. Glucose, maltose and fructose are all reducing sugars and would have turned red the first time. -
An organelle measures 25 mm in a micrograph taken at × 5000. What is its actual length?
A) 5 µm
B) 0.5 µm
C) 50 µm
D) 125 µmA) 5 µmCells
Actual size = image size ÷ magnification = 25 000 µm ÷ 5000 = 5 µm. Getting 50 µm comes from converting millimetres to micrometres incorrectly. -
Six different mRNA codons all specify the amino acid leucine. Which feature of the genetic code does this illustrate?
A) Each base is read as part of only one triplet
B) The same triplet codes for the same amino acid in all organisms
C) Most amino acids are coded for by more than one triplet
D) Some triplets do not code for any amino acidC) Most amino acids are coded for by more than one tripletGenetic Information and Variation
There are 64 triplets for 20 amino acids, so most amino acids, like leucine, have several triplets: the code is degenerate. Being read in only one triplet describes the code being non-overlapping. -
In the light-independent reaction, which two products of the light-dependent reaction are needed when GP is reduced to triose phosphate?
A) ATP and oxygen
B) Reduced NAD and ATP
C) ATP and reduced NADP
D) Oxygen and reduced NADPC) ATP and reduced NADPEnergy Transfers
Reduced NADP supplies the hydrogen and ATP the energy. Reduced NAD belongs to respiration, and oxygen is a by-product, not a reactant. -
In a population in Hardy–Weinberg equilibrium, 9% of individuals have a recessive phenotype. What is the frequency of heterozygotes?
A) 0.42
B) 0.09
C) 0.21
D) 0.49A) 0.42Genetics Populations and Ecosystems
q² = 0.09, so q = 0.3 and p = 0.7; 2pq = 2 × 0.7 × 0.3 = 0.42. 0.21 forgets to multiply by 2, and 0.49 is p². -
Which gene mutation is most likely to change every triplet after the point of mutation?
A) Substitution of one base
B) Inversion of three bases
C) Deletion of three bases
D) Addition of one baseD) Addition of one baseControl of Gene Expression
Adding one base causes a frame shift, altering every triplet downstream. Deleting three bases removes one triplet and leaves the rest of the reading frame intact.
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About these cards
Review status: Second-reader reviewed, with corrections applied.
Checked against:
- Topic outline follows the AQA AS and A-level Biology (7401/7402) specification, version 1.6 (July 2026) (outline only; no specification text reproduced).
- OpenStax Biology 2e, consulted as a reference; no text copied.
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