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MCAT Question A Day - 5/30/14 - Answer!

DNA from phage resistant bacteria is extracted and placed on agar with phage-sensitive E. coli. After incubation it is determined that these E. coli are now also resistant to phage attack. The most likely mechanism for their acquisition of resistance is:

A.  transduction.
B.  sexual reproduction.
C.  transformation.
D.  conjugation.

C is correct. Because DNA is acquired directly from the medium, this is transformation. Transduction is the transfer of DNA via a virus. There is no sexual reproduction in bacteria. Conjugation occurbetween two bacteria.

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