Leu^- Bacteria Are Mixed in a Flask with Leu⁺ Bacteria

question 69

Multiple Choice

leu^- bacteria are mixed in a flask with leu⁺ bacteria, and soon all bacteria are leu⁺. However, if the leu^- cells are on one side of a U-tube, which is divided into two compartments by a filter with fine pores, and the leu⁺ cells are on the other, the leu^- cells do not become prototrophic. Which process is likely to produce this observed result?

• A) conjugation
• B) transduction
• C) transformation
• D) reciprocal translocation
• E) transfection

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