What is the main role of cell membranes?
The main role of cell membranes is to control the movement of substances into and out of cells or organelles.
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What is the effect of increasing the permeability of a cell membrane?
Increasing the permeability of a cell membrane causes more substances to pass through.
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Name 2 factors that increase the permeability of cell membranes.
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Describe how low temperatures affect cell-surface membranes.
Low temperatures mean that phospholipids do not have much energy and are packed closely together to form a rigid cell-surface membrane.
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Describe what happens to cell-surface membranes when temperature is increased.
When temperature is increased, phospholipids move faster and aren't packed as closely together.
If temperature increases too much, the phospholipid bilayer breaks down and channel and carrier proteins denature. This increases the permeability of the cell-surface membrane.
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Describe what happens to cell-surface membranes when cells are placed in a solvent.
When placed in a solvent, phospholipids dissolve to make the cell-surface membrane more fluid and more permeable.
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Describe how an increase in solvent concentration affects cell-surface membranes.
An increase in solvent concentration increases the permeability of cell-surface membranes.
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