AS & A Level Biology (9700) — May–June 2025, Paper 13
40 questions · every question answerable online with instant point-by-point AI marking against the official mark scheme.
Start with Question 1 →The diagram shows a scale used to calibrate an eyepiece graticule. Each division of the eyepiece graticule is equal to how many micrometres? A 1 μm B 5 μm C 10 μm D 100 μm
Answer this question and get it marked →The photograph shows an animal cell viewed using an electron microscope. Which diagram shows what this cell would look like when viewed using a light microscope? A [diagram…
Answer this question and get it marked →Norovirus has a diameter of 30 nm. Mimivirus has a diameter of 400 nm. The maximum resolution of a light microscope is 0.25 μm. Which of these organisms can be detected using a…
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 comparison of red blood cells with plant cells is correct? A Red blood cells have a larger surface area to volume ratio than plant cells. B Red blood cells have a cell wall…
Answer this question and get it marked →A student centrifuges a sample containing bacteria at low speed and then at high speed. Which structure would be isolated together with the bacteria at low speed? A chloroplasts B…
Answer this question and get it marked →The diagram shows the structure of a virus. What do labels 1 and 2 identify? 1 = capsid; 2 = phospholipid envelope A 1 = capsid; 2 = phospholipid envelope B 1 = phospholipid…
Answer this question and get it marked →Which statement about macromolecules is correct? A Cellulose is a branched polymer of glucose monomers. B DNA is composed of two polymers of nucleotide monomers. C Glycogen is an…
Answer this question and get it marked →Sucrose is heated with dilute acid. Which statement describes what happens? A Sucrose is oxidised to form glucose and galactose. B Sucrose is hydrolysed to form two glucose…
Answer this question and get it marked →A student classifies three polymers P, Q and R. P = glycogen, Q = amylopectin, R = energy storage polymer Which row is correct? A P = amylose, Q = glycogen, R = cellulose B P =…
Answer this question and get it marked →A carboxyl group is released on hydrolysis of which molecules? 1 phospholipids 2 proteins A 1 only B 1 and 2 C 2 only D neither 1 nor 2
Answer this question and get it marked →Which bonds are found in the secondary structure (1) and tertiary structure (2) of a protein? A 1 = hydrogen bonds only; 2 = hydrogen, ionic and disulfide bonds B 1 = hydrogen…
Answer this question and get it marked →Which two amino acids have no overall charge at pH 7? A aspartate and glutamate B alanine and glycine C lysine and arginine D aspartate and lysine
Answer this question and get it marked →Which property of water allows it to undergo only small temperature changes when heat energy is added or removed? A high latent heat of vaporisation B high specific heat capacity…
Answer this question and get it marked →An enzyme has histidine on its surface and proline inside. Which statement correctly explains this arrangement? A Histidine is hydrophobic and proline is hydrophilic. B Histidine…
Answer this question and get it marked →A competitive inhibitor is added to an enzyme-catalysed reaction. What happens to the Michaelis-Menten constant (Km) and maximum rate of reaction (Vmax)? A Km increases; Vmax…
Answer this question and get it marked →Which components of the cell surface membrane can act as antigens? 1 glycoproteins 2 glycolipids 3 phospholipids A 1 and 2 B 1 and 3 C 2 and 3 D 1, 2 and 3
Answer this question and get it marked →The diagram shows components of a cell surface membrane. X is a glycolipid and Y is a carrier protein. Which row correctly identifies X and Y? A X = carrier protein; Y =…
Answer this question and get it marked →Antimycin is a drug that blocks the electron transport chain in mitochondria. Which processes would be directly affected by antimycin? A active transport and facilitated diffusion…
Answer this question and get it marked →Visking tubing containing starch solution is placed into a solution of iodine. After 15 minutes, what would be observed? X = colour of iodine solution; Y = colour inside Visking…
Answer this question and get it marked →A cell has chromosomes that are not yet at the equator of the cell and each chromosome consists of two chromatids. Which stage of mitosis is this cell in? A prophase B metaphase C…
Answer this question and get it marked →A student counts the following in a cell: 5 chromosomes, 5 centromeres, 16 telomeres. Which row gives the correct totals? A 4 chromosomes, 4 centromeres, 16 telomeres B 5…
Answer this question and get it marked →Which statements about tRNA are correct? 1 tRNA molecules carry amino acids to ribosomes. 2 tRNA has the same base sequence as mRNA. 3 Each tRNA molecule has an anticodon. A 1 and…
Answer this question and get it marked →What does 'the genetic code is universal' mean? A All organisms have the same number of genes. B All organisms use the same amino acids. C All organisms use the same number of…
Answer this question and get it marked →How many hydrogen bonds form between cytosine and guanine in DNA? A 1 B 2 C 3 D 4
Answer this question and get it marked →Three proteins are produced by different numbers of genes: Type IX collagen = 3 genes; haemoglobin = 2 genes; HIV protease = 1 gene. Which row correctly matches the proteins to…
Answer this question and get it marked →A photomicrograph at ×80 magnification shows vascular tissue in longitudinal section. Which tissue is shown? A xylem only B phloem only, transverse section C xylem only,…
Answer this question and get it marked →Bond R is a bond between water molecules in the xylem. Which type of bond is R and what property does it give to water in the xylem lumen? A R = covalent bond; cohesion in lumen B…
Answer this question and get it marked →Water and solutes pass through the leaf via the symplast pathway. Which statement about the symplast pathway is correct? A Water moves through the cell walls. B Water moves…
Answer this question and get it marked →A person has an atrial septal defect (ASD) — a hole between the left and right atria. Which statement describes the effect on blood oxygen levels? A More oxygen in the aorta; less…
Answer this question and get it marked →Which statement about the mammalian cardiovascular system is correct? A The aorta carries deoxygenated blood to the lungs. B The pulmonary vein carries deoxygenated blood from the…
Answer this question and get it marked →What is the function of the atrioventricular (AV) node? A It initiates the heartbeat. B It delays transmission of the electrical impulse from the atria to the ventricles. C It…
Answer this question and get it marked →Which statement about haemoglobin saturation is correct at intermediate partial pressures of oxygen? A Haemoglobin is fully saturated at intermediate partial pressures. B…
Answer this question and get it marked →Label Q on a diagram of the bronchiole indicates smooth muscle. What is the function of structure Q? A To produce mucus to trap pathogens. B To transport mucus towards the…
Answer this question and get it marked →Which feature maintains a steep diffusion gradient in the alveoli? A thick walls of the alveoli B the presence of mucus in the alveoli C high concentration of oxygen in the air…
Answer this question and get it marked →Which statements about antibody structure are correct? 1 The variable region determines the specificity of the antibody. 2 Y = hinge region containing disulfide bonds. 3 Z =…
Answer this question and get it marked →A mutation in a gene for a penicillin-binding protein causes antibiotic resistance. Which statement correctly explains this? A Penicillin binds more tightly to the mutated…
Answer this question and get it marked →Which sequence correctly describes the events of phagocytosis? 1 lysosome fuses with the phagosome 2 pathogen is engulfed 3 pathogen is digested 4 phagosome forms A 2 → 4 → 1 → 3…
Answer this question and get it marked →Which function(s) are carried out by plasma cells? 1 engulf and destroy pathogens 2 produce memory cells 3 secrete antibodies A 1 only B 1 and 2 only C 2 and 3 only D 3 only
Answer this question and get it marked →Which disease is caused by a eukaryotic pathogen? A AIDS B cholera C malaria D tuberculosis
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