Which one of the following is not a constituent of cell membrane?
A
Cholesterol
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B
Glycolipids
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C
Proline
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D
Phospholipids
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Solution
The correct option is D Proline The biological membranes are made up of lipids and proteins. The various lipids present in the membrane are phospholipids, cerebrosides, gangliosides, cholesterol, glycolipids etc. Proline is an amino acid which is generally known as chain breaker because of its structure. Proline is generally absent in membrane proteins. Proline usually occurs in regions where protein chain makes sharp turns.