Prolactin
a. stimulates the mammary glands to produce
milk.
b. affects only animals with mammary glands.
c. causes the development of breasts and other
secondary sexual characteristics in the
male.
d. acts in concert with FSH to produce milk.
e. has secondary effects on reducing the size
of the uterus after birth
A
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What mechanism leads to changes in allele frequencies due to random chance?
A. Genetic drift B. Natural selection C. Sexual selection D. Neutral variation E. inbreeding
Four of the following can cause birth defects. Which one is the exception?
a. tobacco b. alcohol c. poor nutrition d. rubella e. folic acid
Considering that leaf stoma have the conflicting functions of allowing gaseous carbon dioxide into the leaf, yet preserving the plant's supply of water, which of the following is (are) reasonable?
A. Corn, oats, rice, and wheat-all monocots-have relative upright blades with sunlight hitting both sides and would have stoma distributed evenly on both sides. B. Tree leaves that orient flat and present the top side to the sun would have most of their stoma on the bottom of the leaf. C. A submerged-water plant would have no stoma. D. All of the choices are reasonable. E. None of the choices are reasonable, since stoma are found uniformly on all type of leaves.
Viral capsids are made from subunits called
A. spikes. B. capsomers. C. prophages. D. envelopes. E. peplomers.