Penicillin selection is a positive selection for the isolation of mutants with growth factor requirements.

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Penicillin selection is a method used for the selection of bacterial mutants that have altered cell wall synthesis or repair pathways, and it is not used for the isolation of mutants with growth factor requirements. Instead, growth factor selection involves the use of nutrient-deficient media or depletion of specific nutrients in order to select for mutants that are able to synthesize or acquire the required growth factors.

Penicillin Selection Is a Positive Selection for the Isolation of Mutants