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

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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answer: accepted answer: aquatic animals use the oxygen dissolved in water to carry out respiration. since the amount of dissolved oxygen in water is low as compared to the amount of oxygen in the air, therefore the rate of breathing in aquatic animals is much faster than it is in terrestrial animals.

explanation: