Question

The human sperm releases a substance to dissolve egg membrane, called as

• A. Hyaluronidase
• B. Hyaluronic acid
• C. Fertilizin
• D. Antifertilizin

Answer 1

Answer: (A)

Hyaluronidase

A. The acrosome of sperm contains proteolytic and hydrolytic enzymes like hyaluronidase. This enzyme aids the penetration of sperm cells into layers surrounding the egg, thus allowing fertilisation.

B. Hyaluronic acid is a natural substance present in the skin that has the capacity to hold moisture.

C. Fertilizin is a chemical compound present in the eggs. It is a glycoprotein which is composed of different kinds of amino acids and monosaccharides. Due to the presence of fertilizin, the eggs are supposed to attract the sperms which contain a particular type of antifertilizin.

D. Antifertlizin is a type of protein present in sperms which interacts with fertilizin (a glycoprotein present in egg) and fertilisation occurs.

Hence, the substance released by human sperm to dissolve egg membrane is Hyaluronidase.

So, the correct answer is 'Hyaluronidase'.