AS & A Level Biology (9700) — May–June 2024, Paper 12
40 questions · every question answerable online with instant point-by-point AI marking against the official mark scheme.
Start with Question 1 →A prokaryotic cell which is 1 um in diameter is magnified 50000 times in an electron micrograph. What is the diameter of the cell in the electron micrograph?
Answer this question and get it marked →The diagram shows a plant cell with some labelled structures. Label P points to a small dense circular structure inside a larger structure; label Q points to a small organelle…
Answer this question and get it marked →Which size of ribosome is found in mitochondria and typical prokaryotic cells?
Answer this question and get it marked →Which row about typical prokaryotic cells and typical animal cells is correct? The columns are 'lysosomes present for the break down of old organelles' and 'ATP is produced by the…
Answer this question and get it marked →Which row is correct for the structures present in typical plant cells and typical animal cells? The columns are 'cell structure', 'plant cell' and 'animal cell'.
Answer this question and get it marked →Which row is correct for cellulose? The columns are 'rotation of alternate monomers by 180 degrees', 'shape of molecule' and 'hydrogen bonds between molecules'. (key: tick =…
Answer this question and get it marked →Which statements about peptide bond formation are correct? (1) The bond formation occurs between a carbon of one amino acid and a nitrogen of the next amino acid after the amino…
Answer this question and get it marked →The diagram shows naturally occurring D-glucose and a form of glucose that can be synthesised in the laboratory, known as L-glucose. The two ring structures are mirror images of…
Answer this question and get it marked →Tests for biological molecules were carried out on three solutions. Each solution contained only one type of biological molecule. The observations were: solution 1 - Benedict's…
Answer this question and get it marked →Which row describes the expected effect on Vmax and Km when a competitive reversible inhibitor is added to an enzyme-catalysed reaction? The columns are 'effect on Vmax' and…
Answer this question and get it marked →The graph shows the effect of substrate concentration on the rates of reaction of three enzymes, X, Y and Z. Enzyme X rises steeply and plateaus at about 1500 product per second…
Answer this question and get it marked →Which row correctly identifies the weak and strong bonds in the tertiary and quaternary structure of a typical protein? The columns are the bond types: disulfide, hydrogen,…
Answer this question and get it marked →Which row correctly describes haemoglobin? Each row gives four statements about haemoglobin structure and function.
Answer this question and get it marked →Which process always takes place without the involvement of energy from ATP?
Answer this question and get it marked →The diagram shows the entry of molecule X into a cell. Molecule X moves from outside the cell through a transport protein in the phospholipid bilayer into the cell. Which row…
Answer this question and get it marked →The electron micrograph shows some human blood cells. Cell X is labelled - a red blood cell that appears shrunken with a crinkled (spiky) outline. Which row correctly shows the…
Answer this question and get it marked →A red indicator solution was mixed with agar and the resulting solid was cut into small cylindrical blocks. The blocks were placed in an acid which turns the indicator yellow and…
Answer this question and get it marked →Which metabolic processes will be very active in a cell that has just completed cytokinesis? (1) ATP formation; (2) DNA replication; (3) protein synthesis.
Answer this question and get it marked →The diagram shows a typical mitotic cell cycle and the point in the cell cycle that has been reached by each of four cells, V, W, X and Y. The cycle is divided into G1 phase, S…
Answer this question and get it marked →The graph shows the mean length of the spindle fibres during mitosis. The curve rises from zero (region A), reaches a peak (point B), then decreases (region C) back down to zero…
Answer this question and get it marked →The mRNA codons ACU, ACC, ACA and ACG all code for the same amino acid, threonine. Which anticodons could specify an amino acid other than threonine? (1) UCA; (2) ACC; (3) UGU;…
Answer this question and get it marked →Which bond formation does DNA polymerase catalyse?
Answer this question and get it marked →In eukaryotes, the RNA molecules formed during transcription are modified by the removal of non-coding sequences. This is followed by the joining together of coding sequences to…
Answer this question and get it marked →Which row correctly identifies sinks for sucrose transported by mass flow in plants? The columns are 'root storage organ', 'growing leaf bud' and 'growing shoot tip'. (key: tick =…
Answer this question and get it marked →The diagram shows a transverse section through a transport tissue in a plant. Cell 1 is a small cell adjacent to a larger cell; cell 2 is a large cell with a relatively empty…
Answer this question and get it marked →Which statement correctly describes the movement of solutes in the symplast pathway?
Answer this question and get it marked →Which statement helps to explain why water molecules are forced to move through xylem vessel elements as a consequence of transpiration?
Answer this question and get it marked →The diagram shows the internal structure of the mammalian heart. Letter A is at the wall between the left atrium and left ventricle region; letter B is in the septum near the…
Answer this question and get it marked →The diagram shows pressure changes in the left side of the heart during the cardiac cycle, plotting pressure (kPa) against time (s) for the left ventricle, aorta and left atrium.…
Answer this question and get it marked →Which components of blood are present in tissue fluid? The columns are 'phagocytes', 'some proteins' and 'sodium ions'. (key: tick = present, cross = not present)
Answer this question and get it marked →In the lungs, movement of dissolved carbon dioxide out of the capillaries occurs in one of two ways: by diffusion through the endothelial cells of the capillaries; or by leakage…
Answer this question and get it marked →What maintains the steep concentration gradients needed for successful gas exchange in the lungs? (1) Air flow in the alveoli is in the opposite direction to blood flow in the…
Answer this question and get it marked →Where is cartilage tissue always found in the human gas exchange system?
Answer this question and get it marked →Scientists compared the density of goblet cells in the lungs and the density of mucus in the lungs of three groups of people: people who do not smoke and do not have lung disease;…
Answer this question and get it marked →Which disease does Mycobacterium bovis cause?
Answer this question and get it marked →An antibiotic inhibits the formation of cross-links between the molecules that form cell walls in bacteria. Which statements explain why bacteria are killed by the antibiotic? (1)…
Answer this question and get it marked →Scientists investigated the effect of increasing concentrations of an antibiotic on the development of antibiotic resistance in bacteria. The scientists grew four groups of…
Answer this question and get it marked →What is the correct sequence of events in a primary immune response?
Answer this question and get it marked →Which statement about the properties of the antigen-binding sites in different antibody molecules is correct?
Answer this question and get it marked →The diagram shows a stage in monoclonal antibody production: X + cancer cells - hybridoma cells. What is represented by X?
Answer this question and get it marked →