AS & A Level Biology (9700) — May–June 2025, Paper 14
40 questions · every question answerable online with instant point-by-point AI marking against the official mark scheme.
Start with Question 1 →Plant cells were observed at ×400 magnification. Which structures could be clearly visible in these cells? A cell surface membranes B centrioles C nucleoli D ribosomes
Answer this question and get it marked →The diagram shows a stage micrometer used to calibrate an eyepiece graticule. Y is the number of eyepiece graticule divisions and Z is the number of stage micrometer divisions.…
Answer this question and get it marked →The diagram shows two stage micrometer scale readings used to measure pollen tube growth. The pollen tube grows 5 μm in one hour. What is the growth rate? A 5 μm h⁻¹ B 10 μm h⁻¹ C…
Answer this question and get it marked →Which structures are found in both chloroplasts and mitochondria? 1 DNA 2 70S ribosomes 3 mRNA A 1, 2 and 3 B 1 and 2 only C 1 and 3 only D 2 and 3 only
Answer this question and get it marked →Which structure in a muscle cell would increase in number in a person who trains regularly as a runner? A cell surface membrane B mitochondrion C nucleus D ribosome
Answer this question and get it marked →Which functions are carried out by the Golgi body? 1 production of lysosomes 2 modification of polypeptides 3 synthesis of DNA A 1 only B 1 and 2 only C 2 and 3 only D 1, 2 and 3
Answer this question and get it marked →A unicellular organism is found to have a nucleus, mitochondria and a cell wall. Which statement is correct? A The organism is not prokaryotic because it has a nucleus. B The…
Answer this question and get it marked →Boiled diastase is added to a starch solution. What would be observed when iodine solution and Benedict's reagent are added? A iodine = blue-black; Benedict's = blue B iodine =…
Answer this question and get it marked →Which substance is required for sucrose hydrolysis? A amylase B maltase C hydrochloric acid D sodium hydroxide
Answer this question and get it marked →A Venn diagram has three overlapping circles: unsaturated fatty acid, collagen, haemoglobin. A molecule with at least two carbon-carbon double bonds would be in which region? A…
Answer this question and get it marked →Which statement about globular proteins is correct? A They are insoluble in water. B They all have quaternary structure. C They can change shape using energy from ATP. D They all…
Answer this question and get it marked →Which diagram correctly shows a hydrogen bond between two water molecules? A [diagram showing H-bond between H of one molecule and O of another] B [diagram showing H-bond between…
Answer this question and get it marked →A detergent disrupts hydrogen bonds in water. What effect would this have on the specific heat capacity and latent heat of vaporisation of water? A both decrease B specific heat…
Answer this question and get it marked →The graph shows the effect of temperature on the activity of compound X. Which row correctly describes compound X? A [enzyme-like, activity decreases above optimum] B [non-enzyme…
Answer this question and get it marked →Enzyme activity was measured at different temperatures. Which statement is correct? A The enzyme has its optimum temperature below 30°C. B The enzyme has its optimum temperature…
Answer this question and get it marked →Inhibitor X is a competitive inhibitor. The graph shows Michaelis-Menten curves with and without the inhibitor. What is the Km value in the presence of inhibitor X? A 0.12 mol…
Answer this question and get it marked →Which substance can pass through the cell surface membrane without a protein? 1 glucose 2 CO₂ 3 Na⁺ ions A 1 only B 1 and 3 only C 1 and 2 only D 2 only
Answer this question and get it marked →Which statement about facilitated diffusion is correct? 1 The rate is limited by the number of transport proteins. 2 It requires energy from ATP. 3 It can move molecules against a…
Answer this question and get it marked →An enzyme is synthesised and secreted from a cell. What is the correct order of organelles involved? 1 cell surface membrane 2 Golgi body 3 rough endoplasmic reticulum 4 secretory…
Answer this question and get it marked →The diagram shows apparatus used to investigate the movement of glucose molecules through a selectively permeable membrane (Visking tubing) at different initial concentrations (1%…
Answer this question and get it marked →The epithelium that lines the stomach is damaged by acid and is renewed every two days. Why is mitosis required to repair the damage? A Mitosis repairs damaged cells. B Mitosis…
Answer this question and get it marked →What is the role of telomeres? A allowing the chromatids to reach the poles during mitosis B holding sister chromatids together C making sure that the sister chromatids are of…
Answer this question and get it marked →Which features of mitosis help to maintain the genetic composition of the cell? 1 the longitudinal division of the centromeres 2 the DNA of the parent cells replicates before…
Answer this question and get it marked →DNA forms a leading strand and a lagging strand during semi-conservative replication. Which row correctly matches the strands to their properties? the strand that is replicated by…
Answer this question and get it marked →How many genes could code for one collagen molecule? A 1 gene only B 2 genes only C 3 genes only D 1 gene or 2 genes or 3 genes
Answer this question and get it marked →The diagram shows some events during the formation of an mRNA molecule at transcription. P = the gene; Q = the ends of the gene; S = sequences spliced out; R = the mature mRNA…
Answer this question and get it marked →Two plants, K and L, are parasites of other plants. Plant K grows into xylem tissue and plant L grows into phloem tissue. Which substances could plants K and L take from the…
Answer this question and get it marked →Which statements are correct for the apoplast pathway? 1 Water enters the cell wall. 2 Water moves by osmosis. 3 Water moves from cell wall to cell wall. 4 Water moves through…
Answer this question and get it marked →Mass flow is the bulk movement of materials from one place to another. Which vessels carry fluids by mass flow? 1 artery 2 phloem sieve tube element 3 vein 4 xylem vessel element…
Answer this question and get it marked →Which features are present in companion cells and also in phloem sieve tube elements? ribosomes plasmodesmata --- --- --- A present not present B present present C not present…
Answer this question and get it marked →Which two terms describe the mammalian circulatory system? A open and double circulation B closed and double circulation C closed and single circulation D open and single…
Answer this question and get it marked →One function of an arteriole is to increase or decrease the flow of blood to tissues. Which of these must be present in an arteriole wall to allow this function? 1 collagen 2…
Answer this question and get it marked →The table shows blood pressures in different parts of the circulatory system: aorta = 16.0 kPa; arteriole = 11.3 kPa; arterial end of capillary = 4.7 kPa; venous end of capillary…
Answer this question and get it marked →Which reaction is catalysed by carbonic anhydrase? A the dissociation of carbonic acid B the formation of carbaminohaemoglobin C the formation of hydrogencarbonate ions and…
Answer this question and get it marked →What directly causes the percentage oxygen saturation of haemoglobin to decrease in actively respiring muscles? A hydrogencarbonate ions B carbon dioxide C carbonic acid D…
Answer this question and get it marked →Which row shows the tissues that are present in the wall of the trachea and also the wall of the bronchus? ciliated epithelium squamous epithelium smooth muscle --- --- --- --- A…
Answer this question and get it marked →Outbreaks of cholera commonly occur in camps set up after a natural disaster. Control measures to limit spread: 1 treating all drinking water supplies with a high concentration of…
Answer this question and get it marked →Tetracycline inhibits 70S ribosomes. Rifamycin inhibits prokaryotic RNA polymerase. Which antibiotics can be used to treat an infection caused by the influenza virus? penicillin…
Answer this question and get it marked →Which cells involved in the primary immune response are phagocytes? A monocytes B plasma cells C T-helper cells D T-killer cells
Answer this question and get it marked →Some ways in which different types of monoclonal antibodies can work: 1 binding to proteins on cell surfaces and triggering the immune system 2 blocking molecules on cell surfaces…
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