A-LevelBiologyCell membranes and transport9700/12 · May/June 2011 · Q31 Mark

Visking tubing is an artificial partially permeable membrane used to demonstrate diffusion. Glucose molecules can pass through the pores in the membrane which are approximately 2.4 nm in diameter. Which of the following could pass through the pores? 1 bacteria 2 haemoglobin 3 ribosomes 4 glycogen

A2 only

B1 and 3 only

C2 and 4 only

Dnone of these

✓ Correct answer

D: none of these

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Topic: Cell membranes and transport, A-Level Biology (syllabus 9700). Multiple choice, 1 mark.
Source: A-Level Biology, May/June 2011 Paper 1 Variant 2, question 3.

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