An obligate anaerobe is an organism that:
A. does not use oxygen but is not poisoned by it
B. requires oxygen
C. is poisoned by oxygen
D. can use oxygen but can get along without it
E. produces oxygen
Answer: C
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Which of the following statements about hair cells is NOT true?
A. They are found in the mammalian ear. B. They are found in the fish lateral line system. C. They can be repaired if they rupture. D. Bending of the cells triggers ion flow across the cell membrane. E. Their structure includes stereocilia and a kinocilium.
Metabolism may have begun when ________ within rocks donated electrons to dissolved carbon monoxide (CO), forming organic compounds
a. oxygen b. iron sulfide c. hydrogen gas d. carbon dioxide e. ammonia
In the figure above, the viral DNA in the
lysogenic pathway
a. has been destroyed by host bacterial enzymes. b. is integrated into the bacterial chromosome. c. has been copied and changed into bacterial DNA. d. is no longer present. e. has been transcribed into RNA
Many new species of desert lizards have arisen from a nonnative population which was introduced into
the American southwest. This example best describes:a. the effects of climatic change. b. sympatric speciation. c. adaptive radiation. d. microevolution. e. allopatric speciation