A-LevelBiologyCell membranes and transport9700/12 · Oct/Nov 2025 · Q171 Mark

What can increase the fluidity of the cell surface membrane at low temperatures? 1 double bonds between carbon atoms in the fatty acid chains 2 cholesterol 3 fatty acids having shorter chains

A1, 2 and 3

B1 and 3 only

C1 only

D2 and 3 only

✓ Correct answer

A: 1, 2 and 3

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Topic: Cell membranes and transport, A-Level Biology (syllabus 9700). Multiple choice, 1 mark.
Source: A-Level Biology, Oct/Nov 2025 Paper 1 Variant 2, question 17.

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