The type of contraception technique that can interfere with implantation of a fertilized egg is ____
a. tubal ligation
b. spermicidal jelly
c. birth control pills
d. an intrauterine device
e. a diaphragm
ANSWER: d
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Which statement is true for scyphozoan medusae?
(a) They are the dominant body form. (b) They are generally smaller than hydrozoan medusae. (c) Most live in freshwater. (d) They are scavengers.
There is always concern that new strains of influenza virus will emerge; lack of resistance to a particularly virulent virus could result in a pandemic. Which statement best describes one mechanism by which a "new virus" could be created?
A. Viral RNA polymerase creates additional RNA genomic segments. B. One of the eight RNA segments of the influenza genome is eliminated from viral genome. C. Viral RNA polymerase creates an inaccurate cDNA copy from which RNA transcripts are synthesized. D. The RNA genome is inaccurately replicated by the viral RNA polymerase. E. The viral genome is inaccurately translated by host ribosomes.
In vertebrates, the CNS consists of the
a. brain and spinal cord. b. brain and gray matter. c. spinal cord and gray matter. d. brain and reflexes. e. spinal cord and nerves.
The ultimate electron acceptor in aerobic respiration is
a. NAD+. b. CO2. c. ADP. d. NADP+. e. O2.