AS & A Level Biology (9700) — May–June 2023, Paper 13
40 questions · every question answerable online with instant point-by-point AI marking against the official mark scheme.
Start with Question 1 →Which feature is visible with a light microscope using a natural light source? A DNA molecule of diameter 2 nm B Paramecium cell of diameter 200 micrometres C phospholipid bilayer…
Answer this question and get it marked →The electron micrograph shows a structure found in the cytoplasm of an animal cell, appearing as a ring of pairs of microtubules (a centriole in cross-section). Which biological…
Answer this question and get it marked →Which cell structures contain nucleic acid? 1 cytoplasm; 2 lysosomes; 3 mitochondria. A 1, 2 and 3 B 1 and 2 only C 1 and 3 only D 3 only
Answer this question and get it marked →Mitochondria are thought to have evolved from prokaryotic cells that were ingested by an ancestral cell. Which feature have prokaryotes lost during their evolution into…
Answer this question and get it marked →Which polymers are present in all viruses, all prokaryotes and all eukaryotes? 1 polynucleotides; 2 polypeptides; 3 polysaccharides. A 1, 2 and 3 B 1 and 2 only C 1 and 3 only D 2…
Answer this question and get it marked →How many of the listed structures typically contain genetic material that has telomeres? The structures listed are: bacterial cell; chloroplast; mitochondrion; nucleus. A 1 B 2 C…
Answer this question and get it marked →Steps 1, 2, 3 and 4 are used to test for a non-reducing sugar. 1 Put 5 cm3 of solution into a test-tube. 2 Add a few drops of acid. 3 Neutralise with alkali. 4 Add 6 cm3 of…
Answer this question and get it marked →Which features contribute to the function of a cellulose molecule? 1 Long chains of glucose molecules coil into a helix. 2 Many hydrogen bonds form between adjacent chains. 3 It…
Answer this question and get it marked →What correctly describes triglycerides? A non-polar molecules that are soluble in ethanol B non-polar molecules that are soluble in water C polar molecules that are soluble in…
Answer this question and get it marked →Cocoa butter contains three different triglycerides made from the fatty acids oleic acid (O), palmitic acid (P) and stearic acid (S). The three triglycerides found in cocoa butter…
Answer this question and get it marked →The Venn diagram shows three overlapping circles for unsaturated triglyceride, haemoglobin and collagen. Region C is the overlap of unsaturated triglyceride and haemoglobin;…
Answer this question and get it marked →The diagram shows the amino acid glutamic acid, with the structure H-C bonded to a COOH group, an NH2 group, and a side chain CH2-CH2-COOH. What is the R group for glutamic acid?…
Answer this question and get it marked →The diagram shows three interactions that hold protein molecules in shape. Interaction 1 is shown between an N-H group and an O=C group (a dashed line); interaction 2 is shown…
Answer this question and get it marked →Some animals produce antimicrobial proteins which protect them from pathogens. These proteins could be used to kill human pathogens, however when used as a medicine they are…
Answer this question and get it marked →A student investigated the effect of substrate concentration on the rate of an enzyme-catalysed reaction. A graph was plotted to show the relationship between these two variables.…
Answer this question and get it marked →The end-product of a metabolic pathway can act as a competitive inhibitor. This is called end-product inhibition and allows a cell to control a metabolic pathway. The diagram…
Answer this question and get it marked →Which row shows the distribution of cholesterol and the carbohydrate chains of glycolipids and glycoproteins in a cell surface membrane? A cholesterol between phospholipid heads…
Answer this question and get it marked →Which row correctly describes all the possible relative concentrations of a substance when the substance is moved by endocytosis or exocytosis? A endocytosis = concentrations…
Answer this question and get it marked →Which statement about simple diffusion is correct? A It requires specific molecules in the cell surface membrane. B It is a passive mode of transporting substances. C It always…
Answer this question and get it marked →Plant cells with the same water potential in their cytoplasm were each put into one of three different concentrations of sugar solution, 10%, 5% and 2.5%. The cells were left for…
Answer this question and get it marked →Which row describes some properties of stem cells? The options are given as a table with a tick for 'is a property' and a cross for 'is not a property' across able to divide by…
Answer this question and get it marked →The mitotic index is a measure of the proportion of cells that are undergoing mitosis in an area of tissue. It is calculated using the formula: mitotic index = (number of cells…
Answer this question and get it marked →Which molecules make up the structure of ATP? 1 adenine; 2 thymine; 3 deoxyribose; 4 phosphate; 5 ribose. A 1, 2 and 3 B 1, 3 and 4 C 1, 4 and 5 D 2, 4 and 5
Answer this question and get it marked →A short piece of DNA, 19 base pairs long, was analysed to find the number of nucleotide bases in each of the polynucleotide strands. Some of the results are shown. A C G T --- ---…
Answer this question and get it marked →Which statement about the role of DNA polymerase in the process of semi-conservative replication of DNA is correct? A DNA polymerase forms the hydrogen bonds between complementary…
Answer this question and get it marked →The diagram shows the process of translation occurring at a ribosome. The mRNA strand has the base sequence CAUUCGCUAAUG and a tRNA molecule, with its anticodon labelled S, is…
Answer this question and get it marked →Which row correctly explains how the structures of phloem sieve tube elements and xylem vessel elements are related to their functions as transport systems? A phloem sieve tube…
Answer this question and get it marked →Which component of plants is used by the apoplast pathway as water is moved from the soil to the xylem? A Casparian strip B cellulose C endodermis D suberin
Answer this question and get it marked →Which statements correctly describe transport pathways in dicotyledonous plants? 1 In the symplast pathway, water may move through intercellular spaces. 2 The symplast pathway may…
Answer this question and get it marked →Plants, such as the tobacco plant, retain very little of the water they take in and the volume of water lost during transpiration is very high. This is because these plants can…
Answer this question and get it marked →Which changes occur as sucrose is transferred from leaves into phloem sieve tubes to be transported to a sink? A water potential in phloem sieve tubes becomes less negative;…
Answer this question and get it marked →The graph shown does not have any axis labels; it shows a straight line with a negative gradient starting at a high value on the y-axis and decreasing as the x value increases.…
Answer this question and get it marked →What is present in the blood in human veins? 1 chloride ions; 2 carbonic anhydrase; 3 oxyhaemoglobin. 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 photomicrograph shows two blood vessels P and Q, which are part of a network that transports blood around the body. Vessel Q has a thick muscular wall and a small lumen;…
Answer this question and get it marked →The diagram shows a blood capillary and the tissue fluid which surrounds it. Points W and X are in the tissue fluid above the capillary at the arteriole end and venule end; points…
Answer this question and get it marked →What happens during ventricular systole in a mammalian heart? A Aortic pressure increases. B Atrioventricular valves open. C Semilunar valves close. D Ventricular pressure…
Answer this question and get it marked →The photomicrograph shows a part of the human gas exchange system with one tissue labelled P, surrounding a small folded lumen. Which row is correct? A part of gas exchange system…
Answer this question and get it marked →How many times must a molecule of oxygen pass through a cell surface membrane as it diffuses from the airspace inside an alveolus, through a cell in the capillary wall, to bind to…
Answer this question and get it marked →A student wrote four statements about cholera. Which statement is not correct? A It can be controlled by vaccination. B It is caused by bacteria spread by ingestion. C HIV/AIDS…
Answer this question and get it marked →Monoclonal antibodies are produced using the hybridoma method. What are removed from the spleen of a mouse to produce monoclonal antibodies? A antigens B clones C lymphocytes D…
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