DNA methylation of a gene during spermatogenesis would be most likely to result in
A. the inactivation of the X chromosome.
B. the inactivation of the paternal allele in the offspring.
C. dosage compensation by the paternal allele.
D. the inactivation of the maternal allele in the offspring.
E. dosage compensation by the maternal allele.
Answer: B
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Which gas is increased in the atmosphere and
amplifies the green house effect?
a. carbon dioxide b. nitrous oxide c. phosphates d. bicarbonates e. more than one of these
Several scientists, including Charles and Francis Darwin, Frits Went and others, demonstrated that auxins caused stems to bend toward light in a series of elaborate experiments. Went was the researcher who finally determined that bending of the stem toward light was a result of which mechanism?
A. Light caused a reduction in auxin concentration and a reduction in stem elongation on the lighted side of the plant stem, and thus a bending in the direction of the light. B. The transport of auxin to the shaded side of the plant stem stimulated stem elongation and a bending in the direction of the light. C. Auxin concentration was equal on both sides (lighted and shaded) of the stem; however, the apical meristem responded to the presence of light. D. A combination of positive phototropism and a negative gravitropism. E. The stems actually were responding to the agar blocks that had been used in the experiments.
Movable bones are features of the sense organs
associated with a. sight. b. hearing. c. taste. d. smell. e. touch.
In a grazing food chain,
A. secondary consumers eat detritus. B. secondary consumers eat photosynthetic organisms. C. primary consumers eat detritus. D. all the consumers are primary consumers. E. primary consumers eat photosynthetic organisms.