Question
Biology Question on human reproduction
Fertilizin is a chemical substance produced from
A
polar bodies
B
middle piece of sperm
C
mature eggs
D
acrosome.
Answer
mature eggs
Explanation
Solution
Egg (ovum) secretes a chemical named fertilizin (composed of glycoprotein = monosaccharides + amino acids). Sperm has on its surface a protein substance called antifertilizin (composed of acidic amino acids). The fertilizin of an egg interacts with the antifertilizin of a sperm of the same species. This interaction makes the sperms stick to the egg surface. The adhesion of sperm to the egg of the same species through chemical recognition is known as agglutination.