A-LevelBiologyCell membranes and transport9700/12 · Feb/Mar 2019 · Q181 Mark

The diagram shows part of a cell surface membrane. [Figure shows a fluid mosaic model of a cell membrane with components labelled 1 to 6] Which row correctly identifies functions of two of the numbered molecules?

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Amolecule: 1, function: acts as an antigen, molecule: 4, function: stabilises the membrane

Bmolecule: 2, function: acts as a receptor, molecule: 5, function: active transport

Cmolecule: 3, function: facilitated diffusion, molecule: 4, function: regulates the fluidity of the membrane

Dmolecule: 6, function: active transport, molecule: 5, function: acts as an enzyme

✓ Correct answer

A: molecule: 1, function: acts as an antigen, molecule: 4, function: stabilises the membrane

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Topic: Cell membranes and transport, A-Level Biology (syllabus 9700). Multiple choice, 1 mark.
Source: A-Level Biology, Feb/Mar 2019 Paper 1 Variant 2, question 18.

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