Question

Which substance is located on the surface layer of the egg and acts to attract compatible sperm?

Options

• Acrosin (a zona lysin)

• Fertilizin (a glycoprotein/acid mucopolysaccharide)

• Antifertilizin (a protein)

• Hyaluronidase (a lytic enzyme)

Answer 1

Fertilizin is a glycoprotein or acid mucopolysaccharide located on the surface layer of the egg. It attracts compatible sperm, activates the acrosomal reaction, and agglutinates sperm to the egg surface.