How does a sperm penetrate an egg?
A) Enzymes in the acrosome dissolve the zona pellucida.
B) The sperm binds to a receptor protein in the membrane and this initiates endocytosis.
C) The forward pressure of the flagellum forces it through the plasma membrane.
D) Spermatids are wedge-shaped and are chemically attracted to the inside cytoplasm of the egg cell.
E) The haploid sets of chromosomes match across the membrane and this triggers the membrane to dissolve.

Question

Quizplus · Accepted Answer

Enzymes in the acrosome of the sperm dissolve the outer layer of the egg, known as the zona pellucida, allowing the sperm to enter and fertilize the egg.

How Does a Sperm Penetrate an Egg