AS & A Level Biology (9700) — October–November 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 light microscope is used to observe two structures that are 200 nm apart on the slide. What is the actual distance between the two structures when the magnification is changed…
Answer this question and get it marked →A cell is shown in the micrograph. The micrograph shows a cell with extensive parallel stacks of membranes (endoplasmic reticulum), several dark rounded organelles, and a large…
Answer this question and get it marked →Which statement supports the fact that mature plant cells contain organelles that carry out the same role as lysosomes?
Answer this question and get it marked →Which cell structures may contain cisternae? Row chloroplast endoplasmic reticulum Golgi body mitochondrion --- --- --- --- --- A may contain may contain may contain does not…
Answer this question and get it marked →The diagram shows some cell structures of one type of cell. The cell is drawn as a rod-shaped (capsule-shaped) cell with: structure 1 - small dots scattered through the cytoplasm;…
Answer this question and get it marked →The diagram shows part of a collagen fibril made of collagen triple helices. The collagen triple helices are linked to each other by one type of bond. This bond is labelled as X…
Answer this question and get it marked →The table shows some information about the polypeptides that make up haemoglobin. For alpha-globin: total number of amino acid residues in the polypeptide chain = 141, position of…
Answer this question and get it marked →Which feature of glycogen distinguishes it from starch?
Answer this question and get it marked →The diagram shows a biological molecule. The molecule is drawn as a glycerol backbone (three carbons each shown with hydrogens) with three long hydrocarbon fatty acid chains…
Answer this question and get it marked →A mixture of glucose and starch solutions was placed in a length of dialysis (Visking) tubing and the tubing sealed. The tubing was then placed in a boiling tube containing…
Answer this question and get it marked →Which molecules are globular proteins? 1 amylase; 2 haemoglobin; 3 DNA polymerase.
Answer this question and get it marked →The initial rate of a reaction catalysed by an enzyme was measured at various substrate concentrations. Which graph shows the effect of a low concentration of non-competitive…
Answer this question and get it marked →Gout is a type of arthritis in which small uric acid crystals form inside and around the joints. It causes sudden attacks of severe pain and swelling. The diagram shows how uric…
Answer this question and get it marked →Phospholipids are formed in a similar way to triglycerides. A sample contained six phospholipid molecules. The molecular weight of a phosphate ion is 95 g/mol. The molecular…
Answer this question and get it marked →Which statements about phospholipids in cell surface membranes are correct? 1 Fatty acid tails allow most ions to pass through the membrane. 2 Hydrophobic tails point inwards…
Answer this question and get it marked →In an experiment, pieces of onion epidermis are put into three different concentrations of sucrose solutions, P, Q and R. The pieces of onion are left for an hour and then…
Answer this question and get it marked →The electron micrograph shows rod-shaped bacteria. The actual length of the bacterium is 2.0 um and the diameter is 0.5 um. Assume that the bacterium is cylinder-shaped. What is…
Answer this question and get it marked →Chickens have 78 chromosomes in the nucleus of a body cell. How many DNA molecules are there in a chicken body cell at the start of prophase of mitosis?
Answer this question and get it marked →The photomicrograph shows cells undergoing mitosis, with one cell labelled X. Cell X contains chromosomes that are condensed and aligned along the equator of the cell (metaphase).…
Answer this question and get it marked →Which processes occur in bone marrow cells that are in a mitotic cell cycle? 1 Phosphate groups bind to ADP molecules to form ATP. 2 Bonds form between nucleotides in a DNA…
Answer this question and get it marked →The enzyme telomerase prevents loss of telomeres after many mitotic cell cycles. Which cells need to transcribe telomerase enzyme? 1 stem cells; 2 activated memory B-lymphocytes;…
Answer this question and get it marked →A polypeptide molecule contains the amino acid sequence: glycine - leucine - lysine - valine. The table shows DNA triplets for these amino acids: glycine = CCC; leucine = GAA;…
Answer this question and get it marked →The diagram shows a section of a strand of DNA. The diagram shows three nucleotides joined into a strand, each nucleotide having a phosphate group, a pentose sugar (drawn as a…
Answer this question and get it marked →Which row correctly describes cytosine? Row ring structure number of hydrogen bonds it forms with its complementary base type of base --- --- --- --- A double three purine B…
Answer this question and get it marked →During the production of protein molecules, only one strand from the DNA double helix is used. Which name is given to the DNA strand that is used to produce a new protein?
Answer this question and get it marked →The diagram shows a longitudinal section of a phloem sieve tube with a companion cell. Four positions are labelled A, B, C and D. Label A points to a position within the sieve…
Answer this question and get it marked →The diagram shows a phloem sieve tube element and a companion cell that are involved in translocation of sucrose. The boundary region between the two cells is labelled with…
Answer this question and get it marked →Which types of molecules are cotransported into companion cells?
Answer this question and get it marked →The diagram shows a section through the human heart, with four structures labelled A, B, C and D. Label A points to a vessel at the top of the heart; label B points to the chamber…
Answer this question and get it marked →The graph shows how the volume of the left ventricle changes during one cardiac cycle. Ventricular volume is plotted against time, ranging from 100 cm3 down to 40 cm3. Point A is…
Answer this question and get it marked →Which statement is correct?
Answer this question and get it marked →Which row is correct for an artery? Row inner layer middle layer outer layer --- --- --- --- A smooth layer of endodermis cells collagen, elastic fibres and smooth muscle collagen…
Answer this question and get it marked →Which row shows the features of the gas exchange surface that increase diffusion of carbon dioxide and oxygen? Row concentration gradient diffusion distance --- --- --- A steep…
Answer this question and get it marked →The electron micrograph shows some of the airways in the gaseous exchange system of an insect and the respiring body cells that surround them. Annotations note that each trachea…
Answer this question and get it marked →Which row is correct for the wall of the trachea and the wall of the bronchus? (The row applies to both the trachea and the bronchus.) Row cartilage smooth muscle goblet cells ---…
Answer this question and get it marked →A bacterial pathogen produces a protein that acts as a toxin. This toxin is harmful to humans. Scientists are developing monoclonal antibodies that can be used to detect the…
Answer this question and get it marked →Which statements are correct for penicillin? 1 It is harmful to prokaryotic cells. 2 It disrupts cell wall synthesis. 3 It becomes less effective with regular use.
Answer this question and get it marked →Why is passive immunity effective for only a short time?
Answer this question and get it marked →Which row is correct for the control or prevention methods for each disease? Row TB malaria cholera --- --- --- --- A vaccination chlorination of water vaccination B chlorination…
Answer this question and get it marked →Peptidoglycan is stained purple by the chemical crystal violet. Which cells would stain purple in the presence of crystal violet?
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