A sac fungus is exposed to a mutagen, and it mutates so that it cannot produce a functional ascocarp. The most likely consequence is
A. this is a vestigial structure, so there is no consequence.
B. fruiting bodies would not occur.
C. asexual spores would not be produced.
D. lichens could not form.
E. cellular metabolism could not occur.
B. fruiting bodies would not occur.
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Which of the following statements is NOT correct regarding the "multiregional" and "out of Africa" hypotheses for the origin of modern humans
A. The "multiregional" hypothesis predicts an approx. two million year divergence time between African and non-African mitochondrial DNA sequences. B. The "out of Africa" hypothesis is consistent with an approx. 200, 000 year divergence time between African and non-African mitochondrial DNA sequences. C. The "multiregional" hypothesis predicts that African samples would form a monophyletic group in a phylogenetic analysis of African and non-African samples. D. The "out of Africa" hypothesis predicts that African samples should form a paraphyletic group in a phylogenetic analysis of African and non-African samples.
Peptide and protein hormones are polar molecules that ____
a. inhibit the effect of nonpolar hormones b. alter the effect of certain genes c. bind to a receptor at the cell membrane d. move directly across the cell membrane and enter the nucleus e. form ATP
The onset of AIDS is often accompanied by
A. a positive HIV test. B. lung infections and other opportunistic infections. C. a steep drop in T cell numbers. D. macrophage infection. E. Kaposi's sarcoma.
Poor farming practices, such as plowing land straight up and down a hill, led to the formation of the Providence Canyon in Georgia in a process called _____.
A. root stripping B. soil redistribution C. soil erosion D. leaching E. vesselization