Two F^{+ E}

question 28

Multiple Choice

Two F^{+ E.coli} strains are co-cultured in the same flask.One is Str^r Thr⁺ and the other is Gen^r Thr⁻.The culture is then plated on minimal media that is supplemented with gentamycin only (not threonine) and a few colonies grow.What sort of genetic exchange is most likely occurring?

• A)transformation
• B)conjugation
• C)transduction
• D)electroporation