Which of the following is(are) among the most
effective contraceptive approaches?
a. abstinence
b. tubal ligation
c. vasectomy
d. hormonal implant
e. all of these
E
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If the copy number of a proto-oncogene is increased by gene duplication then the proto-oncogene has undergone
A. a missense mutation. B. gene amplification. C. a chromosomal translocation. D. retroviral insertion. E. a nonsense mutation.
A condition that interferes with the ability of the small intestine to take up nutrients is
a. gastritis. b. colitis. c. a malabsorption disorder. d. diverticulitis. e. diverticulosis.
Viruses can be harmless or even beneficial.
a. true b. false
What is considered one of the best sources of evidence for biological evolution?
A. the biblical creation story B. fossil record C. evidence for an intelligent designer D. the presence of analogous structures