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Which one of the following is not a constituent of cell membrane?

1. glycolipids
2. proline
3. phospholipids
4. cholesterol

Correct answer: proline

Solution

Cell membranes are mainly made of phospholipids, cholesterol, proteins, and carbohydrate-containing molecules like glycolipids. Proline is an amino acid, so it is not a membrane constituent by itself.

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