Messenger RNA molecules contain information that is used to synthesize ________.
A. fatty acids
B. nucleotides
C. polypeptides
D. amino acids
Answer: C
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Why has it been difficult to generate drugs to treat AIDS?
A. HIV mutates rapidly among infected humans. B. People with HIV infections die very rapidly, before the drugs have a chance to cure them. C. HIV does not cause AIDS. D. HIV does not use any enzymes that can be targeted by drugs. E. The only way to kill a virus is with a vaccine, not with drugs.
Embryonic stem cells are pluripotent. What
does this mean?
a. they can divide an unlimited amount of times b. they can give rise to most, but not all body cell types c. they can give rise to any of the body cell types d. they are indestructible e. they can give rise to different, unique individuals
Heterochrony
1.is a change in the timing of development. 2.causes the morphology of closely related species to be the same. 3.is a different rate of growth in various body parts. 4.is a cause of mass extinction. 5.None of the options is correct.
The reacting molecules in an enzyme-catalyzed reaction are called ________.
Fill in the blank(s) with the appropriate word(s).