A-LevelBiologyCell membranes and transport9700/12 · May/June 2021 · Q151 Mark

Which factors can be changed to affect the rate of facilitated diffusion across a cell surface membrane? 1 the surface area of the membrane 2 the concentration gradient 3 the number of specific protein channels

A1, 2 and 3

B1 and 2 only

C1 and 3 only

D3 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, May/June 2021 Paper 1 Variant 2, question 15.

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