Practice question
Question
Membranes isolated from two cell types contain phospholipids, cholesterol, proteins and carbohydrates. However, one membrane contains a much higher proportion of protein relative to lipid than the other.
Which conclusion is best supported?
Explanation
Cell membranes mainly contain lipids and proteins, and also possess cholesterol and carbohydrates. Different cell types may contain these basic components in different proportions, so their protein-to-lipid ratios need not be identical.
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