AS & A Level Biology (9700) — October–November 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 →Which combination of lenses for a light microscope will give the greatest magnification? eyepiece lens objective lens --- --- --- A x5 x100 B x10 x40 C x15 x40 D x15 x100
Answer this question and get it marked →The diagram shows an electron micrograph of virus particles in a human nucleus, taken at x24 000 magnification. One virus particle is labelled. The labelled virus particle…
Answer this question and get it marked →What is correct about the synthesis and release of the glycoprotein mucin in goblet cells? 1 The protein is produced on ribosomes and a carbohydrate chain is added in the Golgi…
Answer this question and get it marked →What are functions of microtubules? 1 allowing movement of cilia in a bronchus 2 attachment to centromeres during metaphase 3 moving secretory vesicles around a cell A 1, 2 and 3…
Answer this question and get it marked →The diagram shows three overlapping circles labelled Golgi body, mitochondrion and chloroplast. The overlap regions are labelled A (Golgi body and chloroplast), B (Golgi body and…
Answer this question and get it marked →Some features of cells are listed. 1 cell wall 2 cell surface membrane 3 ribosomes Which features can be found in plant cells and in prokaryotic cells? A 1, 2 and 3 B 1 and 2 only…
Answer this question and get it marked →Which bonds are present in all viruses? 1 phosphodiester 2 peptide 3 covalent 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 →A student carried out the Benedict's test on four different concentrations of glucose solution and then recorded the time taken for the first appearance of a colour change (the…
Answer this question and get it marked →Which statements about amylopectin and glycogen are correct? 1 Amylopectin and glycogen contain 1-4 glycosidic bonds. 2 Amylopectin contains beta-glucose. 3 Glycogen contains more…
Answer this question and get it marked →How many statements about fatty acids are correct? - Fatty acids are either saturated or unsaturated. - Fatty acids always have at least two double bonds. - Long chains of fatty…
Answer this question and get it marked →The diagram represents an amino acid: an H2N group, a central carbon bonded to an H and a variable side chain R, and a carboxyl COOH group. R represents a variable side chain.…
Answer this question and get it marked →The graph shows the effect of an enzyme on a reaction, with energy of system plotted against time. The substrate energy level is higher than the product energy level. Curve X…
Answer this question and get it marked →The graph shows the results of two experiments on the effect of increasing substrate concentration on the rate of an enzyme-catalysed reaction. One experiment was at a high…
Answer this question and get it marked →Which statements about the Michaelis-Menten constant (Km) of an enzyme are correct? 1 At the Km value, half the active sites of the enzyme should be occupied by the substrate. 2…
Answer this question and get it marked →Which component of cell surface membranes helps to reduce fluidity of the phospholipids at high temperatures? A phosphate groups B unsaturated fatty acids C cholesterol D proteins
Answer this question and get it marked →Plant cells were left for 50 minutes in three different sugar solutions, 10%, 5% and 1%. The water potential in the cytoplasm of the three cells was the same at the start of the…
Answer this question and get it marked →The graph shows the effect of increasing the side length of agar cubes on the surface area and the volume of the cubes. Line 1 is the steeper curve that rises more rapidly; line 2…
Answer this question and get it marked →A human embryo consists of 12 cells at the start of day 1. The cells divide by mitosis for 4 complete days at a rate of 1 division every 32 hours. What is the maximum number of…
Answer this question and get it marked →Which diagrams show roles of mitosis? Diagram 1 shows a parent plant producing daughter plants via runners (asexual reproduction). Diagram 2 shows a flower developing into a…
Answer this question and get it marked →Which events are part of the mitotic cell cycle? 1 interphase 2 anaphase 3 cytokinesis A 1, 2 and 3 B 1 and 2 only C 1 and 3 only D 2 only
Answer this question and get it marked →Which statement correctly describes a feature of a DNA molecule? A It has two parallel strands twisted into a double helix. B It has complementary bases all held together by three…
Answer this question and get it marked →Which diagram correctly shows the replication of DNA? Four diagrams (A-D) each show a replication fork with the parental double helix on the left (one strand 3' at top, one strand…
Answer this question and get it marked →The RNA codon wheel is a tool used to find which amino acid would be translated from an mRNA sequence. Codon position 1 is in the centre of the wheel, codon position 2 is in the…
Answer this question and get it marked →Four students sketched diagrams of the apoplast pathway and the symplast pathway through root cells towards the xylem. Each diagram shows a row of cells with a Casparian strip in…
Answer this question and get it marked →The photomicrograph shows some xerophytic adaptations in leaf tissue. Structure 1 points to hairs on the leaf surface, structure 2 points to a rolled leaf edge, and structure 3…
Answer this question and get it marked →Which processes are required for the transfer of assimilates from a source cell into a phloem sieve tube? A active transport, facilitated diffusion and simple diffusion B active…
Answer this question and get it marked →When sucrose is loaded into the phloem it has to travel from mesophyll cells to a companion cell and then into the phloem. Which row shows the relative concentrations of sucrose…
Answer this question and get it marked →Which feature of transport in plants is correct for xylem and phloem? A It is passive. B It occurs by mass flow. C It occurs from source to sink. D It occurs only in one direction.
Answer this question and get it marked →The diagram shows an anterior view of a vertical section through the human heart. Label 1 points to the pulmonary artery, label 2 to a valve between an atrium and a ventricle,…
Answer this question and get it marked →What does the inner layer of veins and capillaries contain? A collagen fibres B elastic fibres C endothelium D smooth muscle
Answer this question and get it marked →The graph shows the changes in blood pressure and water potential across a blood capillary from the arterial end of the capillary to the venous end of the capillary. Blood…
Answer this question and get it marked →Which statement is correct about a red blood cell that has just entered a capillary in a respiring muscle? A There is a net decrease in chloride ions. B There is a net decrease in…
Answer this question and get it marked →The graph shows some blood pressure changes that occur in a human during one cardiac cycle, with pressure plotted against time for the aorta, the left ventricle and the left…
Answer this question and get it marked →Which statements about all bronchioles are correct? 1 They have goblet cells. 2 They have epithelial cells. 3 They have muscle tissue. A 1, 2 and 3 B 1 and 2 only C 1 and 3 only D…
Answer this question and get it marked →The electron micrograph shows tissue at x850 magnification. What is shown in the electron micrograph? A scanning electron micrograph of bronchial epithelium and lymphocytes B…
Answer this question and get it marked →Which statement correctly describes infectious diseases? A They are diseases caused by environmental factors that are not passed from one person to another. B They are diseases…
Answer this question and get it marked →Organism X produces molecule Y, which blocks the activity of 70S ribosomes. An experiment was carried out to investigate the effect of Y on bacterial cells. An agar plate with…
Answer this question and get it marked →A patient has had repeated infections from the same pathogen over a few months. The patient has been treated with the same antibiotic on each occasion. Which treatment could…
Answer this question and get it marked →A patient with kidney failure can be given a kidney transplant. Sometimes the donated kidney cells are killed by the patient's body. In this primary immune response, T-lymphocytes…
Answer this question and get it marked →The diagram shows the simplified structure of an antibody (a Y-shaped molecule). Labels X and U point to the two tips of the upper arms (the variable/antigen-binding regions), V…
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