Which one of these statements is true about reproduction in humans? a. one sperm will fertilize one egg
b. all the eggs produced are fertilized
c. males and females are born with a supply of reproductive cells
d. females will produce a mature egg through out their lives ​

A

Explanation:

The egg and sperm each contain one set of chromosomes. To ensure that no more than one sperm fertilizes the egg, once the acrosomal reactions take place at one location of the egg membrane, the egg releases proteins in other locations to prevent other sperm from fusing with the egg.

many other transport proteins, often called pumps, move materials against a concentration gradient. active transport drives molecules across a membrane from a region of lower concentration to a region of higher concentration. this process, shown in figure 5.1, uses transport proteins powered by chemi- cal energy.