AS & A Level Biology (9700) — May–June 2023, Paper 21
6 questions · every question answerable online with instant point-by-point AI marking against the official mark scheme.
Start with Question 1 →Fig. 1.1 is a transmission electron micrograph of a cell from the stem of sago pondweed, Stuckenia pectinata, at magnification x2500. The cell wall and an air space are labelled,…
Answer this question and get it marked →Glycogen and cellulose are polymers. Fig. 2.1 shows small, representative regions of a glycogen molecule and a cellulose molecule. The glycogen region is drawn as a branched chain…
Answer this question and get it marked →State why membrane proteins are required for the movement of molecules, such as glucose, across cell surface membranes into cells.
Answer this question and get it marked →The gene for the enzyme catalase is on chromosome 11 in humans. Explain the meaning of the term gene.
Answer this question and get it marked →Fig. 5.1 is a longitudinal section of a capillary in muscle tissue as viewed with a transmission electron microscope, at magnification x2000. Cells are visible inside the…
Answer this question and get it marked →Fig. 6.1 is a diagram showing the passage of water through the tissues of a flowering plant from the soil to the atmosphere. The arrows show the direction of water movement. The…
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