Can somebody plz tell me the difference btwn the two as far as function is concerned? Do they both prevent multiple fertilzation? Also, a question from Achiever Which of the following membrane structures serves as fast block to multiple fertilizations at an animal egg cell? . Jelly coat B. Corona radiata C. Zona pellucida D. Fertilization membrane E. None of the above I put C the first time i took this exam, but now I think it is zona pellucida or vitelline membrance. The answer is D: It is the swift acrosomal process of membrane depolarization on the egg cell that has phenomenally been known as the fast block to multiple fertilizations. Can somebody plz explain? thanks in advance !