Human Reproduction Question 57
57. Fertilizins are emitted by
[1991, 1997]
(a) immature eggs
(b) mature eggs
(c) sperms
(d) polar bodies
Show Answer
Answer : b
Hints & Solutions
(b) A glycoprotein fertilizin (composed of monosaccharides and amino acids) is secreted by a mature egg. Penetrating sperm also has some proteinaceous substance on its surface called antifertilizin. Due to the interaction between fertilizin & antifertilizin, the sperm adheres to the egg. Antifertilizin is an acid protein secreted by the acrosome. This makes the sperms stick to the surface of the egg.
