A-LevelBiologyCell membranes and transport9700/12 · May/June 2019 · Q141 Mark

The diagram shows a simple cell signalling pathway in which a signal molecule leads to a response, such as a secretion. [Figure: Flowchart signal molecule → P → Q → response] Which row identifies P and Q?

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AP: activated enzyme in cytoplasm, Q: target in cell surface membrane

BP: lipid in cell surface membrane, Q: extracellular enzyme

CP: protein in cell surface membrane, Q: activated enzyme in cytoplasm

DP: target in cytoplasm, Q: protein in cell surface membrane

✓ Correct answer

C: P: protein in cell surface membrane, Q: activated enzyme in cytoplasm

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Topic: Cell membranes and transport, A-Level Biology (syllabus 9700). Multiple choice, 1 mark.
Source: A-Level Biology, May/June 2019 Paper 1 Variant 2, question 14.

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