The rate of net primary productivity can be limited directly by the availability of
A) organic nutrients in the soil solution.
B) inorganic nutrients in the soil solution.
C) organic carbon in the soil solution.
D) inorganic carbon in the soil solution.
B
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Edge effects are the result of which of the following?
A. Populations of flora and fauna have emigrated from the core of their population center to the edge of their habitat. B. Metapopulations of some of the larger fauna have become more dominant on the landscape and as a result have increased the edge of their habitat. C. Habitat fragmentation or habitat shrinkage has occurred, and thus the edge of the habitat has increased in relative proportion. D. Habitat fragmentation or habitat shrinkage has occurred, and thus the edge of the habitat has decreased in relative proportion. E. Populations of particular species have decreased and are on the edge of extinction.
Which of the following statements regarding genital warts is incorrect?
A. Certain strains predispose a person to cancer of the cervix or penis. B. They form large cauliflower-like masses called condyloma acuminata. C. They are not common in the United States. D. They are sexually transmitted. E. They often occur on the penis, vagina, and cervix.
Craig Mellow investigated RNA interference by injecting antisense and double-stranded RNAs into C. elegans. If the antisense and double-stranded RNAs were very similar, but not identical, to C. elegans mex-3, what would be the results of their experiment?
A. Virtually all the C. elegans mex-3 RNA would be degraded, so embryos from worms injected with antisense and double-stranded RNA would not be green. B. Many different C. elegans RNAs would be degraded, so embryos from worms injected with antisense and double-stranded RNA would most likely be dead. C. More C. elegans mex-3 mRNA would be produced by transcription, so embryos from worms injected with antisense and double-stranded RNA would be green. D. The C. elegans mex-3 RNA would be inhibited, but not degraded, so the embryos from worms injected with antisense and double-stranded RNA would be green.
In some species, such as Steller sea lions, a sexual polymorphism for longevity is observed, with females liv-ing on average several years longer than males. Use an evolutionary explanation of senescence to explain this polymorphism
a. Males have a higher mutation rate than females. b. Males have higher age-specific fertility at older ages than females. c. Sexual selection imposes a more severe trade-off between fitness and longevity in males than in females. d. Males do not need to live as long as females to attain the same fitness.