AS & A Level Biology (9700) — February–March 2023, Paper 12
40 questions · every question answerable online with instant point-by-point AI marking against the official mark scheme.
Start with Question 1 →The photomicrograph shows cells from a human blood smear, labelled with a line PQ across a neutrophil and a cell Q. Which calculation shows a correct method to calculate the…
Answer this question and get it marked →A student calibrated an eyepiece graticule using a stage micrometer. - Each division of the stage micrometer was 0.01 mm. - With a ×10 magnification objective lens, 10 eyepiece…
Answer this question and get it marked →Which statements are correct for chloroplasts and also for mitochondria? 1 They contain 80S ribosomes. 2 They can transcribe their circular DNA. 3 They can translate mRNA. 4 They…
Answer this question and get it marked →The electron micrograph shows some cells from a root, with four structures labelled A, B, C and D. Which cell structure is not usually found in cells from a root?
Answer this question and get it marked →Dialysis (Visking) tubing is an artificial partially permeable membrane with pore sizes of approximately 2.5 nm. Glucose molecules have a diameter of about 1.5 nm and can pass…
Answer this question and get it marked →What is present in all viruses? A ribose B deoxyribose C adenine D thymine
Answer this question and get it marked →To estimate the concentration of glucose in an unknown solution, equal volumes of a range of known concentrations of glucose were each mixed with the same excess volume of…
Answer this question and get it marked →Which statements are correct for amylose and also for amylopectin? 1 They are carbohydrate molecules. 2 They are formed by condensation reactions. 3 They are linear molecules. 4…
Answer this question and get it marked →Which statement is a correct comparison between saturated triglyceride molecules and unsaturated triglyceride molecules of approximately the same molecular masses? A Unsaturated…
Answer this question and get it marked →The diagram represents a molecule from a cell surface membrane, with four parts labelled A, B, C and D. Which description of one of the labels is correct? A fatty acid at the…
Answer this question and get it marked →Which row correctly shows levels of protein structure that can be held together by each type of interaction (hydrogen bonds, covalent bonds, hydrophobic interactions)? A hydrogen…
Answer this question and get it marked →Which molecules contain at least three double bonds? Four molecules are shown: a saturated triglyceride (A or C area), collagen, haemoglobin and one further labelled molecule,…
Answer this question and get it marked →Which diagram correctly shows hydrogen bonding between two water molecules? Four diagrams A, B, C and D each show two water molecules with partial or full charges marked; the…
Answer this question and get it marked →Which statement describes an example of an extracellular enzyme? A Amylase in saliva is an enzyme that catalyses the breakdown of starch in the mouth. B Carbonic anhydrase is an…
Answer this question and get it marked →Which row is correct for enzymes that catalyse reactions using the lock-and-key hypothesis (effect on activation energy; shape of active site compared to the substrate)? A lowers…
Answer this question and get it marked →A scientist investigated the rate of breakdown of hydrogen peroxide. Four experiments were carried out using different mixtures: substrate only; substrate + enzyme; substrate +…
Answer this question and get it marked →Which of these substances can pass directly through cell surface membranes without using a carrier protein or a channel protein? 1 Ca²⁺ 2 CO₂ 3 C₆H₁₂O₆ A 1 and 2 B 1 and 3 C 2 and…
Answer this question and get it marked →What happens to the surface area to volume ratio of a cube when the length of each side is doubled? A The ratio decreases by four times. B The ratio halves. C The ratio doubles. D…
Answer this question and get it marked →Which events are part of the mitotic cell cycle? 1 interphase 2 telophase 3 cytokinesis 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 →The estimated total number of red blood cells in the human body is 2.5 × 10¹³. It is estimated that, each day, 2.5 × 10¹¹ red blood cells are removed from the circulation and are…
Answer this question and get it marked →DNA polymerase catalyses condensation reactions between molecules during semi-conservative replication of DNA. What is joined by DNA polymerase? A base and base B base and…
Answer this question and get it marked →Two polynucleotide strands make up a DNA molecule. Which description is correct? A The percentage of cytosine is 50% of that of guanine in the whole molecule. B The percentage of…
Answer this question and get it marked →The PDx1 protein is found in a wide range of animal species where it is regarded as essential for normal metabolism. In sand rats, the PDx1 gene coding for the PDx1 protein has a…
Answer this question and get it marked →Different tissues in a plant were supplied with a radioactively labelled substance to identify which tissues were actively synthesising mRNA. Which radioactively labelled…
Answer this question and get it marked →Which row correctly matches the structure and function of phloem sieve tube elements? A structure: peripheral cytoplasm with no nucleus; function: to provide as little resistance…
Answer this question and get it marked →Which feature of xylem vessel elements helps adhesion during transpiration? A Lignin forms a complete secondary wall. B New vessels carry extra water as the plants grow. C There…
Answer this question and get it marked →Mass flow is the bulk movement of materials from one place to another. How many of the vessels listed carry fluids by mass flow? - artery - phloem sieve tube - vein - xylem vessel…
Answer this question and get it marked →Cellulose, lignin and suberin are components of various plant cell walls. Descriptions of these cell wall components are listed. 1 a component of the Casparian strip 2 redirects…
Answer this question and get it marked →The arrows show the direction of water movement across a plant root, from water in the soil to the xylem. Arrows are numbered 1 to 8, with plasmodesmata marked at certain points.…
Answer this question and get it marked →Which row correctly identifies sources and sinks of sugars (root cells absorbing mineral ions; storage cells of a seed that is starting to grow)? A root cells: sink; storage…
Answer this question and get it marked →The photomicrograph shows a section through a tissue with an artery. Which row correctly shows the type of artery and whether the blood inside the artery is oxygenated or…
Answer this question and get it marked →Heart surgery may cause a decrease in the transmission of impulses in the Purkyne tissue to the right side of the heart. What is a possible effect of this decrease? A Impulses…
Answer this question and get it marked →The diagram shows a network of blood vessels that supply blood to muscle tissue in the human body, with an artery feeding capillaries and a vein draining them. Point X is in the…
Answer this question and get it marked →Scientists have shown that the oxygen dissociation curves for haemoglobin of smaller mammals are to the right of those of larger mammals. What does this suggest about the…
Answer this question and get it marked →What is an effect of an increased concentration of carbon dioxide in the blood? A increased movement of chloride ions out of red blood cells B increased concentration of…
Answer this question and get it marked →Two of the requirements of an efficient gas exchange system are a large surface area and a short diffusion distance. Which row correctly describes how alveoli are adapted to meet…
Answer this question and get it marked →What defines infectious diseases? A Symptoms are caused by a bacterium that passes from contaminated air, soil or water to a host. B Symptoms are caused by a pathogen that is…
Answer this question and get it marked →A hurricane destroys a large town on an island. People move away from the town and set up tents, where sanitation is poor. Which disease is most likely to spread within a week of…
Answer this question and get it marked →Which statement correctly explains why viruses are unaffected by penicillin? A Penicillin only affects host cell metabolism. B Penicillin only binds with 70S ribosomes. C…
Answer this question and get it marked →Which processes characterise the mode of action of phagocytes? 1 antibody production 2 receptor binding 3 endocytosis 4 exocytosis 5 hydrolysis A 1, 2 and 4 B 1 and 4 only C 2, 3,…
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