When Lederberg and Tatum Performed Their Experiments on Gene Transfer

question 3

Multiple Choice

When Lederberg and Tatum performed their experiments on gene transfer in bacteria that lead to our understanding of conjugation,what were their controls?

• A)They mixed strains A and B together.
• B)They put strain A on one side of a U-shaped tube and strain B on the other,with a filter between them.
• C)They found bio^- met^- cells.
• D)They plated strain A and strain B separately onto minimal media plates to screen for spontaneous prototrophs.
• E)They observed mating bridges with transmission electron microscopes.

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