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Which of these operons is anabolic?

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Which of these operons is anabolic?

(a) Lac

(b) Ara

(c) Trp

(d) Phe

This question was addressed to me by my college director while I was bunking the class.

This intriguing question originated from Operons : Trp topic in section Gene Expression : Transcription Prokaryotes of Cytogenetics

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Correct answer is (c) Trp

The explanation is: Trp operon is anabolic as it codes for enzymes that help in the synthesis of the amino acid tryptophan. On the other hand Ara and Lac operons are catabolic as they help in breaking down the respective sugar.

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