A-LevelBiologyCell membranes and transport9700/12 · May/June 2015 · Q151 Mark
Which description of cell surface membrane permeability is correct?
AAn increase in the concentration of cholesterol molecules in the cell surface membrane can increase its permeability to hydrophilic substances.
BCell surface membrane permeability to large hydrophilic molecules is high and can be increased by membrane transport proteins involved in facilitated diffusion.
CThe permeability of the cell surface membrane to ions is increased with an increase in the proportion of saturated fatty acids in the phospholipids.
DWithout the presence of carrier and channel membrane proteins, the cell surface membrane has a low permeability to large polar molecules.
✓ Correct answer
D: Without the presence of carrier and channel membrane proteins, the cell surface membrane has a low permeability to large polar molecules.
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