When strains A and B autotrophic for different compounds are

When strains A and B autotrophic for different compounds) are mixed together, they readily form prototropns; However, in the Davis U tube, they do not. These cells must Be undergoing _________. transformation lysogeny transduction mutation conjugation

Solution

The answer must be conjugation because conjugation requires physical contact of two bacterial cells but here we see cells dont pass the membrane so no physical contact is possible

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