A-LevelBiologyCell membranes and transport9700/12 · Feb/Mar 2017 · Q191 Mark

The diagram shows two pathways, X and Y, through which molecules can diffuse across a cell surface membrane. Which row correctly shows possible pathways for lipids, water and glucose? [Figure 19.1]

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AX only X and Y Y only

BX only Y only Y only

CX and Y X only X and Y

DX and Y X and Y X only

✓ Correct answer

A: X only X and Y Y only

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Topic: Cell membranes and transport, A-Level Biology (syllabus 9700). Multiple choice, 1 mark.
Source: A-Level Biology, Feb/Mar 2017 Paper 1 Variant 2, question 19.

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