The base analog 5-bromouracil can tautomerize. One tautomer behaves like thymine and the other behaves like cytosine. If 5-bromouracil is used as a mutagen, what is the minimum number of times replication must occur to mutate the codon for proline (CCC) into the codon for alanine (GCC)?
A) one generation
B) two generations
C) three generations
D) 5-bromouracil cannot induce this mutation
D) 5-bromouracil cannot induce this mutation
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a. stimulates; also stimulates b. stimulates; inhibits c. inhibits; stimulates d. inhibits; also inhibits e. binds receptors on; does not bind receptors on
The primary ions that contribute to the salinity of ocean waters are
A) calcium and sodium. B) sodium and chloride. C) sodium and carbonate. D) calcium and chloride.
The extraordinary accuracy of the DNA polymerase III enzyme lies in its ability to "proofread" newly synthesized DNA, a function of the enzyme's __________
A) 3?-to-5? exonuclease activity B) 5?-to-3? exonuclease activity C) 3?-to-5? polymerase activity D) 5?-to-3? polymerase activity E) 3?-to-5? helicase activity
Immunotherapy is the
A. administering of preformed antibodies. B. use of antitoxins. C. conferring of passive immunity. D. use of immune serum globulin. E. All of these choices are correct.