Sperm Cannot Fertilize an Egg Unless They Have Been in the Female

Multiple Choice

Sperm cannot fertilize an egg unless they have been in the female reproductive tract for several hours.This enhanced ability of the sperm to fertilize the ovum is called capacitation.In vitro studies indicate that the sperm can fertilize the ovum if they are first washed before being introduced to the ovum.These observations suggest that

A) capacitation involves the removal of some inhibiting substance(s) from the sperm.
B) capacitation is temperature-dependent.
C) in capacitation, secretions of the female reproductive tract are taken up by the sperm.
D) pH is an important factor in the process of capacitation.
E) only sperm that come into contact with vaginal secretions are capable of fertilizing an ovum.