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 occurs between two bacteria.
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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 occurs between two bacteria.
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