A pro- strain of bacteria, which has not been in contact with any other strains, develops the ability to produce the amino acid proline. This mutant "rescue" could have been caused by
A. addition of the pro+ gene via transformation.
B. mutation of the pro- gene during phage integration.
C. correction of the pro- gene by reverse transcriptase.
D. addition of the pro+ gene via transduction.
E. removal of the pro- gene during excision.
Answer: D
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