AS & A Level Biology (9700) — May–June 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 →A graticule and a micrometer scale can be used to measure the size of biological structures that are viewed with a microscope. A diagram of a microscope is shown with three…
Answer this question and get it marked →Six organelles found in eukaryotic cells are shown (not to scale), labelled 1 to 6: 1 a nucleus, 2 a mitochondrion, 3 a ribosome/rough ER fragment, 4 smooth endoplasmic reticulum,…
Answer this question and get it marked →Which cell structures can have mRNA inside them? 1 chloroplast; 2 mitochondrion; 3 nucleus; 4 rough endoplasmic reticulum. A 1, 2, 3 and 4 B 1, 2 and 3 only C 2, 3 and 4 only D 3…
Answer this question and get it marked →A scientist carried out an experiment to separate the organelles in an animal cell by mass. The cells were mixed with a buffer solution which had the same water potential as the…
Answer this question and get it marked →Which structures are found in palisade mesophyll cells and photosynthetic prokaryotes? 1 cell surface membrane; 2 cellulose wall; 3 ribosomes; 4 chloroplasts. A 1, 2, 3 and 4 B 1,…
Answer this question and get it marked →Which polymers are present in all viruses and all prokaryotes? 1 polynucleotides; 2 polypeptides; 3 polysaccharides. 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 →Which set of steps is the best method for conducting the emulsion test for lipids? A Add 2 cm3 of water to the sample. Pour the water into a test-tube containing 2 cm3 of ethanol.…
Answer this question and get it marked →A student was provided with a solution of carbohydrate. They removed two samples and performed tests on each. Sample one was tested directly with Benedict's test, and the…
Answer this question and get it marked →The Venn diagram shows three overlapping circles for sucrose, collagen and haemoglobin. Region C is the overlap of sucrose and collagen; region A is the overlap of sucrose and…
Answer this question and get it marked →What describes cellulose? A a branched chain of 1-4 alpha-glucose B a branched chain of 1-4 beta-glucose C an unreactive linear chain of 1-4 alpha-glucose D an unreactive linear…
Answer this question and get it marked →Which part of the structure of haemoglobin carries oxygen? A four polypeptide chains B haem groups C hydrogen bonds D hydrophilic R groups
Answer this question and get it marked →What is the maximum number of hydrogen bonds that can form between two single water molecules? A 1 B 2 C 3 D 4
Answer this question and get it marked →CYP3A4 is an important enzyme in the human digestive system where it is needed to break down a range of different toxins. The activity of CYP3A4 has been shown to be reduced by…
Answer this question and get it marked →A fixed volume and concentration of substrate and enzyme were mixed. All other variables were kept constant. The enzyme-catalysed reaction was left until it was complete. Four…
Answer this question and get it marked →Which molecules in cell surface membranes are typically involved in cell recognition? The options are given as a table with a tick for 'involved' and a cross for 'not involved'…
Answer this question and get it marked →What can increase the fluidity of the cell surface membrane? 1 single bonds between carbon atoms in the fatty acid chains; 2 cholesterol; 3 longer-chained fatty acids. A 1, 2 and…
Answer this question and get it marked →The three main factors that affect the rate of diffusion across a membrane can be expressed by the relationship: rate of diffusion is proportional to (surface area x concentration…
Answer this question and get it marked →A student measured the time taken for complete diffusion of a dye into agar blocks of different sizes which were suspended in the dye. The results are shown. size of agar block…
Answer this question and get it marked →An experiment was carried out to investigate the effect of concentration of sucrose solution on cells in a plant tissue. A sample of plant tissue was cut into seven cylinders of…
Answer this question and get it marked →The diagram shows part of the organisation of a section of a DNA molecule and the associated histones, P and R, in prophase of mitosis, with the DNA labelled Q. Which statement…
Answer this question and get it marked →How many copies of each DNA molecule will be found in a cell at the start of the stages of the mitotic cell cycle shown? The options are given as a table for G1 of interphase and…
Answer this question and get it marked →One characteristic of DNA is that it is a universal genetic code. What is meant by a universal genetic code? A All living organisms use the same triplet code for amino acids. B…
Answer this question and get it marked →Which statement about mRNA is correct? A It is a polymer made of nucleotides all joined with hydrogen bonds. B Each nucleotide subunit contains the sugar ribose. C It always has…
Answer this question and get it marked →The diagram shows part of the process of translation, with structures labelled X, Y and Z. X is the loop of a tRNA molecule that pairs with the mRNA, Y is a part of the mRNA…
Answer this question and get it marked →The DNA triplets of genes are translated as amino acids or stop signals during protein synthesis. The table shows some of these triplets. DNA triplet name of amino acid --- ---…
Answer this question and get it marked →Which row identifies cells with plasmodesmata? The options are given as a table with a tick for 'plasmodesmata present' and a cross for 'not present' across phloem sieve tube…
Answer this question and get it marked →Which statements about the apoplast and symplast pathways are correct? 1 In the apoplast pathway, water molecules move through free spaces in the cellulose cell walls of plant…
Answer this question and get it marked →Where does water evaporate from during transpiration? A intercellular spaces B leaf surface C mesophyll cell walls D stomatal pores
Answer this question and get it marked →The diagram shows the outline of three xerophytic leaves of the same type in three different conditions, P, R and S. In condition P the leaf is flat and open, layer Y labelled; in…
Answer this question and get it marked →The photomicrograph shows a transverse section of the leaf of a species of grass that is specially adapted to grow in a dry habitat, with rolled leaves and hair-like structures.…
Answer this question and get it marked →Which statement supports the theory of active loading of sucrose into companion cells? A The pH decreases in the cell wall of the companion cells compared with the cytoplasm. B…
Answer this question and get it marked →Which properties of water are essential for its role in the transport of blood in mammals? The options are given as a table with a tick for 'essential' and a cross for 'not…
Answer this question and get it marked →The diagram shows some of the events that happen between the plasma and the red blood cells in the circulatory system. A substance 1 moves from the plasma into the red blood cell…
Answer this question and get it marked →The diagrams show the valves in the heart when viewed in cross-section from above at different stages in the cardiac cycle. Diagram 1 shows the semilunar valves open and the…
Answer this question and get it marked →Where are squamous epithelial cells found in the human gas exchange system? The options are given as a table with a tick for 'found' and a cross for 'not found' across trachea,…
Answer this question and get it marked →Which statement about gas exchange between air in the alveoli and blood in the pulmonary capillaries is correct? A The oxygen concentration in the capillaries leaving the…
Answer this question and get it marked →The average thicknesses for some structures in the human respiratory system are shown. structure average thickness of structure /nm --- --- human cell membrane 5 cytoplasm of…
Answer this question and get it marked →The statements refer to the disease tuberculosis (TB). 1 The pathogen is not accessible to the immune system. 2 The bacterial pathogen reproduces slowly. 3 The pathogen is not…
Answer this question and get it marked →The average sizes of some pathogens are shown. pathogen average size /nm --- --- HIV particle 100 Mycobacterium tuberculosis 3000 Plasmodium 20000 Vibrio cholerae 1500 One type of…
Answer this question and get it marked →A successful vaccination programme provides a level of immunity where the majority of a population is protected. There are several factors that can affect the success of a…
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