AS & A Level Biology (9700) — October–November 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 →Which steps are needed to find the actual width of a xylem vessel viewed in transverse section using a x10 objective lens? 1 Convert from mm to um by multiplying by 10^-3. 2…
Answer this question and get it marked →Which cell structure is found in human cells and typical plant cells?
Answer this question and get it marked →Which statements are correct for a typical prokaryotic cell? 1 It contains 70S ribosomes. 2 It contains a cellulose cell wall. 3 It contains circular DNA. 4 It is up to 5 um in…
Answer this question and get it marked →The diagram shows a typical animal cell with various organelles drawn. The membrane system labelled X consists of stacks of flattened membrane channels studded with small dots…
Answer this question and get it marked →What describes a lysosome?
Answer this question and get it marked →The diagram shows a triglyceride. The triglyceride has a glycerol backbone with three fatty acid chains: the top two chains are fully saturated hydrocarbon chains with no…
Answer this question and get it marked →Which description lists all the components of a human haemoglobin molecule?
Answer this question and get it marked →HIV-1 protease is an enzyme produced by the HIV virus. Two identical chains of 99 amino acids form the enzyme. In each chain, amino acids 25, 26 and 27 in the sequence form part…
Answer this question and get it marked →Which statements are correct reasons for how animals cool down in hot environments using latent heat of vaporisation of water? 1 Some animals lie down and roll in wet soil. 2 Fish…
Answer this question and get it marked →Two different enzymes, P and Q, are investigated to find the optimum pH for each enzyme. The results show that P works only in acidic conditions. Q has an optimum pH which is…
Answer this question and get it marked →A student investigated the effect of substrate concentration on the rate of an enzyme-catalysed reaction. The student plotted the results in a graph of reaction rate (in…
Answer this question and get it marked →Which statements could be used to describe enzyme molecules and antibody molecules? 1 Hydrogen bonds stabilise the structure of the protein and are important for it to function…
Answer this question and get it marked →Which description identifies a reversible, non-competitive enzyme inhibitor?
Answer this question and get it marked →Before mitochondria are extracted from cells for microscopy, they are usually kept in a 0.25 mol/dm3 sucrose solution. Why is the sucrose solution used?
Answer this question and get it marked →The photomicrograph shows a type of blood cell. The cells are numerous, rounded and biconcave with no nucleus (red blood cells). Which statements about these cells are correct? 1…
Answer this question and get it marked →Which row is correct for parts of a phospholipid molecule? Row can be saturated or unsaturated can also be found in a triglyceride --- --- --- A head tail B tail head C head head…
Answer this question and get it marked →A student filled dialysis tubing with a sucrose solution and knotted both ends. This formed a cylinder with a length of 5.0 cm and a radius of 2.0 cm. What is the surface area to…
Answer this question and get it marked →Which process does not involve mitosis?
Answer this question and get it marked →The photomicrograph shows cells in an onion root tip. Three cells are labelled X, Y and Z. Cell X shows chromosomes arranged as separated groups moving towards opposite poles;…
Answer this question and get it marked →The diagram shows an outline of the mitotic cell cycle drawn as a circle divided into stages numbered 1, 2 and 3, with cytokinesis labelled as a thin section. Stage 1 is…
Answer this question and get it marked →The diagram shows part of a nucleic acid molecule, drawn as a single strand of four nucleotides each with a phosphate group (circle), a pentose sugar (five-sided ring) and a base…
Answer this question and get it marked →XNA is a laboratory-made nucleic acid. XNA is made of nucleotides in which one component has been replaced by chemical X. The chemical X is organic but is not found in nature. The…
Answer this question and get it marked →Which strand of DNA does RNA polymerase bind to?
Answer this question and get it marked →Which processes occur during the formation of messenger RNA? 1 condensation; 2 polymerisation; 3 replication; 4 transcription.
Answer this question and get it marked →The anticodon for the amino acid tryptophan is ACC. What shows a template DNA sequence that includes the DNA triplet for tryptophan?
Answer this question and get it marked →A student drew a plan diagram of some plant tissue. The diagram is shown and it contains a mistake in the way that it is drawn. The diagram shows a curved outer region with three…
Answer this question and get it marked →Four students have drawn and labelled part of a structure seen on an electron micrograph (a sieve tube element with a companion cell). Which student has labelled their drawing…
Answer this question and get it marked →The diagram shows some structures used for transport in the phloem. It shows cell Y with an associated companion cell at one end of a phloem sieve tube, and cell Z at the other…
Answer this question and get it marked →The diagram shows a section through a root of a dicotyledonous plant, with the xylem vessel, Casparian strip, root cell and root hair cell labelled, and a soil particle next to…
Answer this question and get it marked →The graph shows the effect of different partial pressures of carbon dioxide (CO2) on the oxygen dissociation curve for haemoglobin. Percentage saturation of haemoglobin with…
Answer this question and get it marked →What happens in the heart at the start of ventricular diastole?
Answer this question and get it marked →The electron micrograph shows a longitudinal section through a blood vessel. The vessel has a very thin wall, just one cell thick, with a narrow lumen containing red blood cells.…
Answer this question and get it marked →A student drew a sketch to show the formation of tissue fluid. The sketch shows a capillary with: label A - blood enters the capillary and pressure increases; label B - red blood…
Answer this question and get it marked →Which structures are present in the trachea and also in all bronchioles? 1 cartilage; 2 smooth muscle; 3 epithelial cells.
Answer this question and get it marked →The photomicrograph shows a section through part of the gas exchange system. It shows numerous small thin-walled air sacs (alveoli) with a flattened squamous epithelium. Which…
Answer this question and get it marked →What is the function of the goblet cells in the gas exchange system?
Answer this question and get it marked →Which organisms have cell walls that can be affected by penicillin? 1 bacteria; 2 protoctists; 3 viruses.
Answer this question and get it marked →Each year, there are 462 000 deaths from malaria in children under 5 years old globally. Insecticide-treated nets could prevent 50% of malaria cases and reduce deaths of children…
Answer this question and get it marked →Which row is correct? Row involved in phagocytosis secrete antibodies --- --- --- A T-lymphocytes B-lymphocytes B T-lymphocytes T-lymphocytes C B-lymphocytes B-lymphocytes D…
Answer this question and get it marked →Four steps that occur during the primary immune response to a pathogen are listed. P B-lymphocytes divide by mitosis. Q T-helper cells interact with macrophages that have digested…
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