Molecules that resemble fats but contain phosphate functional groups are called: a. steroids. b. polypeptides. c. phospholipids. d. nucleic acid.

Phospholipids. (Ans. C)

Explanation:

Phospholipids are known as lipid molecules which containing waxes, fats, and some vitamins. Each molecule of phospholipid is made up of a phosphate group head, two fatty acids tails and a glycerol molecule. Phospholipid is main component of the cell membrane.

Fatty acid tails are made up of carbon and hydrogen where phosphate group head is made up of phosphorus molecule attached with four oxygen molecules. Glycerol is helping them to attached with each other.

Some function of phospholipids are:

1) Phospholipid is selectively permeable means semipermeable in nature.

2) Molecules which are dissolved in water can not pass through the membrane and molecules which are dissolved in fat can pass through the membrane.

3) Oxygen, urea, carbon dioxide and some molecules can easily pass through the cell membrane.

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