Which one of the following represents a standard Watson-Crick base pair interaction?
A. G-T
B. C-A
C. G-C
D. A-G
E. T-C
Answer: C
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Hydrochloric acid formed in the stomach converts pepsinogen into pepsin, which enables the stomach to begin digesting ________
Fill in the blank(s) with correct word
Stabilizing selection occurs when
A. the environment controls which organisms will survive. B. humans determine which organisms will survive. C. the extremes of the population have a lesser chance to survive. D. the extremes of the population have a better chance to survive. E. the organisms on one extreme of the population have a better chance to survive than those on the other extreme.
Mutations in the proto-oncogene ras and the tumor-suppressor gene p53
A) increase protein synthesis by the cell. B) can improve the chance of avoiding cancer as one ages. C) can enhance further mutations, which can develop into cancer. D) disrupt normal regulation of the cell cycle.
Which of the following is NOT characteristic of most parasites:
a. they are specialist and usually are able to affect only one variety of hosts. b. they inflict serious injury and kill their hosts. c. some reside inside their hosts, whereas others live outside their hosts. d. their host may be a plant as well as an animal e. parasites are smaller than their hosts