A Pro- Strain of Bacteria,which Has Not Been in Contact

question 25

Multiple Choice

A pro- strain of bacteria,which has not been in contact with any other strains,develops the ability to produce the amino acid proline.What is the most likely mechanism of this mutant "rescue?"

• A)addition of the pro+ gene via transduction
• B)addition of the pro+ gene during conjugation
• C)removal of the pro- gene during excision
• D)addition of the pro+ gene via transformation
• E)correction of the pro- gene by reverse transcriptase

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