A) lipids
B) proteins
C) lipids and proteins
D) carbohydrates
Correct Answer: C
Solution :
Chemically, the plasma membrane or cell membrane is made up of 60% proteins and 40% lipids. The percentage of carbohydrates ranges from 1-10 which are in the form of glycoproteins or glycolipids. Proteins may be extrinsic (peripheral) and intrinsic (integral) while lipids may be phospholipids, glycolipids and sterols.
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