A-LevelBiologyCell membranes and transport9700/12 · May/June 2018 · Q151 Mark
The formula shows how the rate of diffusion across a cell surface membrane can be calculated. surface area × difference in concentration --------------------------------------- thickness of membrane Which row shows how the fastest rate of diffusion can be achieved?
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Asurface area available high, difference in concentration high, thickness of membrane high
Bsurface area available high, difference in concentration high, thickness of membrane low
Csurface area available low, difference in concentration high, thickness of membrane low
Dsurface area available low, difference in concentration low, thickness of membrane high
✓ Correct answer
B: surface area available high, difference in concentration high, thickness of membrane low
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