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The trp operon in E.coli regulates genes that code for enzymes required for synthesis of the amino acid tryptophan. The trp operon is a repressible operon. When tryptophan is not available in the environment, the trp repressor protein is ____ . Therefore, RNA polymerase can bind to the______ to begin transcription

first blank ,actve,inactive or regulated
second blank operator,prometer, or structual genes

Respuesta :

1) inactive
2)promoter

Ans.

Try operon or tryptophan operon represents a cluster of genes that transcribe together to code enzymes for tryptophan production. The try operon is regulated by a repressor protein. When tryptophan is present, it activates repressor protein that binds to operator and prevent expression of genes.

In the absence of tryptophan, repressor protein is present in inactive form that cannot bind to the operator. Therefore, RNA polymerase binds to promoter region and genes for tryptophan synthesis get expressed.

Thus, the correct option to be fill in the first blank is 'inactive or regulated' and for the second blank is 'promoter.'


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