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Which of the following takes place when tryptophan levels are high?

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Which of the following takes place when tryptophan levels are high?

(a) Attenuation at the attenuator structure formed by sequences of 3 and 4

(b) Ribosomes pauses at the Try codons in sequence 1

(c) Formation of paired structure between 2 and 3 sequences prevents attenuation

(d) 2:3 structures, unlike the 3:4 attenuator, does not prevent transcription

This question was addressed to me by my school principal while I was bunking the class.

Query is from Regulation of Gene Expression in Prokaryotes topic in section Regulation of Gene Expression and Miscellaneous of Biochemistry

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Correct option is (a) Attenuation at the attenuator structure formed by sequences of 3 and 4

The best explanation: b, c and d take place when tryptophan levels are low.

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