AS & A Level Biology (9700) — May–June 2024, Paper 13
40 questions · every question answerable online with instant point-by-point AI marking against the official mark scheme.
Start with Question 1 →An eyepiece graticule can be calibrated using a stage micrometer. What is the correct reason why an eyepiece graticule is calibrated? A An eyepiece graticule can be used to make…
Answer this question and get it marked →The image is an electron micrograph of a typical eukaryotic cell. [Electron micrograph of a typical eukaryotic cell, showing a prominent nucleus with darkly stained nucleolus,…
Answer this question and get it marked →Which features are found in typical eukaryotes and also in typical bacteria? The question shows a three-circle Venn diagram. The three circles are labelled with the features: 'can…
Answer this question and get it marked →Which type of cell will have the highest proportion of its volume taken up with cell structures bound by a single membrane? A ciliated epithelial cell B goblet cell C red blood…
Answer this question and get it marked →What causes the phosphate heads of phospholipids to become polar? A The phosphate heads are joined to water molecules by hydrogen bonds. B The phosphate heads are insoluble in…
Answer this question and get it marked →Which statements describe features of cellulose that adapt it for its function in plant cells? 1 Three cellulose molecules coil around each other to form a triple helix structure.…
Answer this question and get it marked →Which structure shows alpha-glucose? The question shows four ring (pyranose) structural formulae of glucose, labelled A, B, C and D. Options A and B are drawn in the standard…
Answer this question and get it marked →What cannot occur as a result of a condensation reaction? A breaking of a glycosidic bond B formation of a disaccharide C joining together of two amino acids D production of a…
Answer this question and get it marked →Which fact about the quaternary structure of proteins is correct? A consists of four polypeptides B depends on the presence of metal ions C depends on the primary structure of the…
Answer this question and get it marked →The diagram shows different molecules in a solution. The diagram shows four molecules labelled P, Q, R and S. Molecule P is large with a cleft (active site). Molecule Q is a small…
Answer this question and get it marked →The effect of substrate concentration on an enzyme-catalysed reaction was measured in three different conditions: - without an inhibitor - with a competitive inhibitor - with a…
Answer this question and get it marked →Which aspect of enzyme activity can be compared by the Michaelis-Menten constant? A activation energy of a reaction with or without an enzyme B affinity of different enzymes for…
Answer this question and get it marked →The number of substrate molecules one enzyme molecule can convert to product in a second is called the turnover number. This number is obtained when all conditions are optimum for…
Answer this question and get it marked →A red indicator solution was mixed with agar, and the resulting solid was cut into small cuboid blocks. The blocks were placed in an acid which turns the indicator yellow, and all…
Answer this question and get it marked →The statements describe some events in the process of exocytosis of glycoprotein molecules. 1 Membrane of the Golgi body folds around glycoprotein molecules. 2 Vesicle binds to…
Answer this question and get it marked →Four cylinders that were identical in size, A, B, C and D, were cut from potatoes that had been stored for different lengths of time. The cylinders were weighed, immersed in 10%…
Answer this question and get it marked →The contents of a daughter cell are compared to the parent cell after one cell cycle. Which row is correct? number of chromosomes volume of cytoplasm length of telomeres --- ---…
Answer this question and get it marked →A high-power photomicrograph shows a cell in a stage of mitosis. The chromosomes are visible and lined up along the cell equator but there is no nuclear envelope. Which stage of…
Answer this question and get it marked →Which statements about the cell cycle are correct? 1 The cell cycle includes interphase and mitosis. 2 DNA replication takes place in interphase. 3 A cell can remain in interphase…
Answer this question and get it marked →A scientist stains the chromosomes of a plant cell with a fluorescent dye to observe the telomeres. This cell has 38 chromosomes. How many telomeres will the scientist observe in…
Answer this question and get it marked →During the semi-conservative replication of DNA, the double helix is unwound by an enzyme. Which diagram shows how the strands are copied? The question shows four diagrams (A, B,…
Answer this question and get it marked →A transcription error results in the deletion of one nucleotide from the middle of a primary transcript. mRNA forms from the primary transcript. Which statement describes one…
Answer this question and get it marked →Which statements correctly describe the process of translation? 1 The nucleotide sequence on an mRNA molecule is used to produce a specific amino acid chain. 2 A section of DNA is…
Answer this question and get it marked →A molecule of mRNA was used in translation. Part of its sequence is shown. GAU CUG UAA CGG There were no introns present in the section of DNA that was transcribed to make this…
Answer this question and get it marked →Which properties of water are dependent on hydrogen bonding between water molecules? The table uses a key: a tick means the property is dependent on hydrogen bonding, a cross…
Answer this question and get it marked →Which substances in xylem tissue are impermeable to water and prevent the collapse of the vessels? impermeable to water prevent collapse --- --- --- A cellulose cellulose only B…
Answer this question and get it marked →The electron micrograph shows a longitudinal section through phloem tissue. [Electron micrograph of a longitudinal section through phloem tissue, showing an elongated sieve tube…
Answer this question and get it marked →Carrier proteins in the cell surface membranes of companion cells are involved in the transfer of assimilates to phloem sieve tubes. The diagram represents the use of two types of…
Answer this question and get it marked →The diagram shows pressure changes during two cardiac cycles. The graph plots pressure (kPa) against time (s) over two cardiac cycles. Three traces are shown: one representing…
Answer this question and get it marked →An irregular heartbeat may be the result of ineffective electrical stimulation of the atria. Which area of the heart could be damaged, causing this irregular heartbeat? A…
Answer this question and get it marked →The diagram shows the effect of three different concentrations of carbon dioxide on the oxygen dissociation curve for human haemoglobin. The graph plots percentage saturation of…
Answer this question and get it marked →Which reactions will be taking place in blood in a capillary that is next to an alveolus? key: Hb = haemoglobin 1 Hb + 4O2 - HbO8 2 H2O + CO2 - H2CO3 3 H2CO3 - H+ + HCO3- A 1 and…
Answer this question and get it marked →Which structure of the gas exchange system always contains cartilage? A alveoli B bronchiole C capillary D bronchus
Answer this question and get it marked →Exchange of carbon dioxide and oxygen occurs between air in the alveoli and blood in the capillaries of the lung. Which partial pressures of the gases will allow gaseous exchange…
Answer this question and get it marked →The plan diagram shows a cross-section of a trachea. The plan diagram shows concentric layers of a trachea cross-section. Four labels point to different tissue layers: A points to…
Answer this question and get it marked →Which layers of cells does an oxygen molecule diffuse through when moving from an alveolus into an alveolar capillary? alveolus alveolar capillary --- --- --- A squamous…
Answer this question and get it marked →Bacteria may be classified according to differences in cell wall structure. The differences are shown by using the Gram stain. The diagram shows part of a Gram-positive bacterium…
Answer this question and get it marked →Which facts relate to the disease TB or its pathogen? 1 Viruses change their antigens to a limited extent. 2 TB is caused by only one species of pathogen. 3 HIV/AIDS makes the…
Answer this question and get it marked →The events listed occur during the primary immune response to a specific pathogen. 1 activation of B-lymphocyte to produce plasma cells and memory cells 2 phagocytosis of invading…
Answer this question and get it marked →Influenza is an infectious disease caused by a virus. It is possible to have influenza more than once. Which statements explain why it is possible to have influenza more than…
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