You Add an Unknown Phage to a Mixture of F⁺

question 124

Multiple Choice

You add an unknown phage to a mixture of F⁺ and F^- cells of

• A)The phage bound to a receptor on the sex pilus,and therefore only infected the F⁺ cells (leaving the F^- cells alone).
• B)The phage bound to a receptor on the F^- cells,leaving only them alive and allowing the F⁺ cells to die off.
• C)The phage integrated (lysogenized)the F^- cells,giving them a selective advantage over the F⁺ cells.
• D)F⁺ cells are uniquely susceptible to phage attack for unknown reasons.
• E)coli and plate out the bacteria.The bacterial colonies that grow are all F^-.How can you explain this phenomenon?

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