__________ species, which evolved in one place and
are present only in that habitat, are highly vulnerable
to extinction. Fill in the blank(s) with the appropriate word(s).
Answer: Endemic
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Which of the following contributed to the dust bowl in the American southwest during the 1930s?
I) overgrazing by cattle II) clear-cutting of forest trees III) plowing of native grasses IV) lack of soil moisture A) I and II B) II, III, and IV C) I, III, and IV D) I, II, III, IV
Select the following phylum that includes animals that are unsegmented, acoelomate, and have a digestive cavity with a single opening.
A. Annelida B. Platyhelminthes C. Nematoda D. Cnidaria E. Rotifera
Mutations in bacterial porins typically lead to antibiotic resistance by
A) changing the orientation of the porin ?-helical transmembrane segments to constrict the size of the channel. B) changing the stereoisomer specificity of the porin transport. C) blocking diffusion of the antibiotic through the porin channel. D) disrupting the voltage difference across the porin channel. E) reversing water transport through the channel.
In Figure 8.3, if compound C reacts with the allosteric site of enzyme A, this would exemplify
A) a mutation. B) repression. C) feedback inhibition. D) competitive inhibition. E) transcription.