I achieved a high A* Grade in my final A-Level exams using these notes!!!
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Cholesterol animal – increases stability of membrane
Fluid-Mosaic model
Fluid: molecules can move
Mosaic: random combination of different carbohydrates / proteins / lipids / cholesterol
b. factors affecting permeability of plasma membrane – fluidity
Temperature: increases KE of membrane molecules – move at faster rate = increases fluidity
too high – proteins denature
Organic solvents ethanol: dissolves phospholipids – creates gaps in membrane = increases fluidity
Less cholesterol = more fluidity
Shorter fatty acid chains = more fluidity
More unsaturated fatty acids (bends at double bonds) = more fluidity
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