DNA strands can be clipped crosswise at selected positions by using enzymes called
A. DNA polymerases.
B. ligases.
C. palindromes.
D. reverse transcriptases.
E. restriction endonucleases.
Answer: E
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Mutations are important because they do what?
(A) provide variation that can result in evolutionary change. (B) occur in response to environmental demands. (C) are always beneficial in the individuals affected by them. (D) usually provide an individual with increased reproductive rates.
Which term refers to an extended period of torpor that an animal enters during the winter when the environment is too cold and food is too scarce?
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Which of the following organisms would be most likely to contaminate a jar of pickles?
A. a neutrophile B. a thermophile C. an acidophile D. an obligate anaerobe E. a mesophile