A-LevelBiologyCell membranes and transport9700/12 · Feb/Mar 2023 · Q51 Mark

Dialysis (Visking) tubing is an artificial partially permeable membrane with pore sizes of approximately 2.5 nm. Glucose molecules have a diameter of about 1.5 nm and can pass through the pores in the membrane. What else can pass through the pores? 1 bacteria 2 haemoglobin 3 ribosomes 4 fructose

A1 and 3

B2 and 4

C2 only

D4 only

✓ Correct answer

D: 4 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 2023 Paper 1 Variant 2, question 5.

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