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In lac operon, there is no apo-repressor...

In lac operon, there is no apo-repressor and co-repressor. But it is present in tryptophan operon. a. Who proposed tryptophan operon? b. What is the significance of the two types of repressor given above?.

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a. Francois Jacob and Jacques Monod
b. Apo-repressor: This is a protein produced by the regulator gene which is unable to bind the operator gene. Co-repressor: When tryptophan binds with the apo-repressor, it is known as co-repressor.
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