Principles of Biology

Which of the following hormones stimulates uterine contractions during the birth process in mammals?

Maintenance of the uterine lining during pregnancy in mammals requires

Which of the following organisms would most likely produce asexually?

The fact that regeneration is a common type of reproduction in sea stars suggests that

Sexual reproduction

Paland and Lynch showed that sexual populations have fewer deleterious mutations than asexual populations.What hypothesis do these results support?

Which of the following cells are haploid?

In female mammals,germ cells

External fertilization

All types of internal fertilization require

Place the following events of the acrosomal reaction in the correct chronological order. (1)The acrosome releases hydrolytic enzymes. (2)Sperm-binding proteins on the membrane bind the sperm. (3)Sperm nucleus enters the egg. (4)Sperm and egg plasma membranes fuse. (5)Sperm contacts the egg's jelly coat.

What would result if more than one sperm fertilized an egg?

How does the embryo of an egg-laying animal obtain nutrients for growth?

Which of the following lists the structures of the male reproductive tract in the proper order from sperm production to ejaculation?

What are the three glands that produce the liquid portion of semen?

Erection occurs when

The inability of a man to produce LH would result in

What structures of the male and female reproductive systems share a common embryonic origin?

Fertilization of an ovum normally occurs in the

In what order do sperm move through the structures of the female reproductive tract?