Homeostasis provides what kind of internal environment?
a. positive
b. tolerable
c. limiting
d. changing
e. chemical and physical
ANSWER: b
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Which of the following statements about telomeres is INCORRECT?
A. Telomeres are lengthened by telomerase. B. Telomeres are found at the ends of chromosomes. C. Telomeres are short repeat sequences. D. Telomeres would be longer in cells of older than younger individuals. E. Telomeres are crucial to the viability of a cell that replicates often.
You are breeding different varieties of roses in your garden. When you cross a true-breeding yellow "Texas Beauty" rose with a true-breeding "Ruby" red rose, you get all red roses. But when you cross a "Texas Beauty" yellow with the yellow variety "Jealousy," you get a 9:7 ratio of red to yellow flowers! What can you conclude from these results?
A. The environment, and not genes, influences pigment in these rose varieties. B. There are epistatic interactions between at least two genes for rose pigment. C. The red allele is dominant to the yellow allele. D. There is a mutation in the gene for yellow pigment in the "Jealousy" variety. E. There is no recessive allele for the red pigment gene.
The sporophyte is the dominant and conspicuous generation in
a. the fern allies and ferns. b. gymnosperms. c. flowering plants. d. all of the above.
During the early Neogene, temperate woodlands replaced tropical forests. During the late Neogene, these were then replaced by grasslands. Which groups were favored by this transition?
A. Angiosperms B. Primates C. Teleost fish D. Herbivores E. Insect pollinators