A-LevelBiologyCell membranes and transport9700/12 · Feb/Mar 2024 · Q171 Mark

Sodium ions can enter cells across the cell surface membrane. Which methods could be used by sodium ions to cross a cell surface membrane and enter a cell?

Aactive transport only

Bactive transport and facilitated diffusion

Cfacilitated diffusion and simple diffusion

Dsimple diffusion only

✓ Correct answer

B: active transport and facilitated diffusion

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Topic: Cell membranes and transport, A-Level Biology (syllabus 9700). Multiple choice, 1 mark.
Source: A-Level Biology, Feb/Mar 2024 Paper 1 Variant 2, question 17.

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