Which description of cell surface membrane permeability is correct?
1 )
An increase in the concentration of cholesterol molecules in the cell surface membrane can increase its permeability to hydrophilic substances.
2 )
Cell surface membrane permeability to large hydrophilic molecules is high and can be increased by membrane transport proteins involved in facilitated diffusion.
3 )
The permeability of the cell surface membrane to ions increases as the proportion of saturated fatty acid chains in the phospholipids increases.
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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