Contrast the need for the enzymes involved in lactose and tryptophan metabolism

Question

Contrast the need for the enzymes involved in lactose and tryptophan metabolism in bacteria when...
A. Lactose and tryptophan are present in the media.
B. Lactose and tryptophan are absent in the media. Contrast the need for the enzymes involved in lactose and tryptophan metabolism in bacteria when...
A. Lactose and tryptophan are present in the media.
B. Lactose and tryptophan are absent in the media.
A. Lactose and tryptophan are present in the media.
B. Lactose and tryptophan are absent in the media.

Explanation / Answer

A- when lactose present in the medium lactose bind to repressor and change its shape and lac gene are expressed while tryptophan bind to trp repressor, which changes shape to bind to the trp operator. Binding of the tryptophan

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