AS & A Level Biology (9700) — May–June 2025, Paper 11
40 questions · every question answerable online with instant point-by-point AI marking against the official mark scheme.
Start with Question 1 →Which statements about light microscopes are correct? 1 To calculate the magnification of a light microscope, the eyepiece lens and objective lens magnifications are added…
Answer this question and get it marked →A student measured the width of a mitochondrion in an electron micrograph of an animal cell with a magnification of ×9600. The width was 6 mm. What was the actual width of the…
Answer this question and get it marked →The photomicrograph shows a section of the stem of a plant, with a cell labelled Q. Which statements could describe Q? 1 The cell wall contains pits. 2 The cell wall contains…
Answer this question and get it marked →The diagram is taken from an electron micrograph of a cell that secretes enzymes. Where are the polypeptides for these enzymes made? The diagram shows a secretory cell with four…
Answer this question and get it marked →Which comparisons between a typical bacterial cell and a typical plant cell are correct? bacterial cell plant cell --- --- --- 1 cytoplasmic DNA nuclear DNA 2 no smooth ER present…
Answer this question and get it marked →The diagram shows a virus with four structures labelled W, X, Y and Z. Which row correctly identifies the labelled biological molecules? W X Y Z --- --- --- --- --- A RNA proteins…
Answer this question and get it marked →The iodine test and the Benedict's test were carried out on samples of a starch solution. Amylase was added to another sample of the starch solution and incubated for 10 minutes.…
Answer this question and get it marked →Which row about α-glucose and β-glucose molecules is correct? carbon atom on which the OH position is different cellulose contains both molecules --- --- --- A 1 no B 1 yes C 4 no…
Answer this question and get it marked →Which molecules are monosaccharides? 1 ribose 2 glucose 3 deoxyribose 4 sucrose A 1, 2 and 3 B 1, 2 and 4 C 1, 3 and 4 D 2, 3 and 4
Answer this question and get it marked →Many animals use triglycerides for long-term energy storage. Which statements are correct additional functions of triglycerides? 1 They provide buoyancy in some marine animals. 2…
Answer this question and get it marked →The diagrams show three different bonds. Bond 1: —NH····O— (hydrogen bond between NH and O) Bond 2: —C(=O)—N—H (peptide bond) Bond 3: —CH₂—S—S—CH₂— (disulfide bond) Which bonds…
Answer this question and get it marked →What describes the quaternary structure of a collagen molecule? A polypeptides that form an α-helix, which are held together by covalent bonds B polypeptides that form a double…
Answer this question and get it marked →The diagram shows the structure of the enzyme amylase. Which level of protein structure results in the folding of amylase into its globular shape? A primary B secondary C tertiary…
Answer this question and get it marked →Which statement explains why large volumes of water maintain a constant temperature when the air temperature increases? A The latent heat of vaporisation of water is high. B The…
Answer this question and get it marked →Which statements about the mode of action of an enzyme are correct? 1 Some enzymes have a region on their surface to which the substrate has a complementary shape. 2 Some enzymes…
Answer this question and get it marked →The graph shows the effect of increasing substrate concentration on the rate of reaction of two enzymes that catalyse reactions with the same substrate. Enzyme P (dashed line)…
Answer this question and get it marked →The cell surface membrane structure is described as a 'fluid mosaic'. What correctly describes the 'mosaic' part of the cell surface membrane? A the different patterns that are…
Answer this question and get it marked →A student immersed a plant tissue in solution S. For the next 30 minutes, the student used a microscope to observe the cells in the plant tissue. During this time, the cytoplasm…
Answer this question and get it marked →A sample of 500 cells dividing by mitosis was examined to identify the stage of mitosis for each cell. The table shows the results. stage of mitosis percentage of cells in the…
Answer this question and get it marked →The diagram shows a chromosome. What are structures P and Q? P Q --- --- --- A centriole chromatid B centromere telomere C centromere centriole D centriole telomere
Answer this question and get it marked →Which processes are used by stem cells during tissue repair? 1 cytokinesis 2 DNA replication 3 transcription 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 enzyme telomerase prevents loss of telomeres after many mitotic cell cycles. Which cells transcribe a high concentration of telomerase? 1 neutrophils 2 mature red blood cells…
Answer this question and get it marked →Which statements are correct? 1 All polypeptides are coded for by genes. 2 All genes are made up of a sequence of nucleotides. 3 All gene mutations result in a change to the…
Answer this question and get it marked →A double-stranded DNA molecule was analysed and 29% of its nucleotide bases were found to be adenine. Which percentage of its nucleotide bases will be cytosine? A 21% B 29% C 42%…
Answer this question and get it marked →In some cells, non-coding sequences of RNA are removed after transcription. Which row correctly states the name of these non-coding sequences of RNA and the type of cell in which…
Answer this question and get it marked →Water potentials were measured inside a leaf cell, in the air spaces of the leaf and in the atmosphere. Which values of water potential (Ψ) would allow water to move from the leaf…
Answer this question and get it marked →Three samples of liquid were taken from different locations in a plant and tested to measure the concentration of four solutes. The results are shown. sample sucrose / mol m⁻³…
Answer this question and get it marked →A heated band was wrapped around the stem of a plant at a height of 1 m above the ground and left for 10 minutes. How will heating a small section of the stem to 60 °C affect the…
Answer this question and get it marked →The diagram shows the structure of an amphibian heart and the movement of blood through it. The diagram shows a three-chambered heart with two atria and one ventricle, with blood…
Answer this question and get it marked →A mutation in one of the genes that codes for haemoglobin changes the affinity of haemoglobin for oxygen. This mutation lowers the partial pressure of oxygen at which haemoglobin…
Answer this question and get it marked →Which processes are responsible for the Bohr shift? 1 Carbon dioxide reacts with haemoglobin to form carbaminohaemoglobin. 2 Carbon dioxide reacts with water to form carbonic…
Answer this question and get it marked →A student viewed a drop of human blood with a microscope and described a cell as having a very large diameter and a U-shaped nucleus that occupies half the volume of the cell.…
Answer this question and get it marked →How many times must an oxygen molecule pass through a cell surface membrane to get from the air in the alveolus to the haemoglobin in a red blood cell? (Assume there are no pores…
Answer this question and get it marked →Asthma can affect children and adults. The air passages become narrower, severely restricting the flow of air into the lungs. Salbutamol is a drug that widens the air passages to…
Answer this question and get it marked →The photomicrograph shows the transverse section of part of the trachea. Which letter represents a tissue that can contract and relax to adjust the diameter of the airways? A A B…
Answer this question and get it marked →Which statements about an infectious disease may be correct? 1 It can be caused by a protoctist. 2 It can be transmitted by an insect vector. 3 It can be transmitted from mother…
Answer this question and get it marked →Which statements explain why cholera has not been eradicated by vaccination? 1 There is limited availability of an affordable vaccine. 2 Protection takes several weeks to develop…
Answer this question and get it marked →Antibiotic resistance is a serious threat to global health. Which statement describes a step that can be taken to reduce the impact of antibiotic resistance? A Antibiotics…
Answer this question and get it marked →Tetanus is an infectious disease caused by a type of bacterium. This bacterium produces a protein that is a toxin which causes illness. Scientists have produced a vaccine for…
Answer this question and get it marked →What is an effect on the immune system of a reduced number of T-helper cells? A a decrease in the destruction of infected body cells by T-helper cells B a decrease in the…
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