10) Transcription of the E. coil tryptophan (tip) operon is controlled by an att

Question

10) Transcription of the E. coil tryptophan (tip) operon is controlled by an attenuation mechanism. Find the false statement regarding this mechanism of regulation. A) Involves the coupling of translation and transcription to regulate gene expression. B) At the very beginning of the polycistronic mRNA, there is a leader sequence that can be translated by ribosomes and that contains a stretch of repeated tryptophan's. C) High levels of tRNAs charged with tryptophan will lead to attenuation of transcription. D) Efficient synthesis of the entire leader peptide prematurely terminates the transcription of the polycistronic mRNA. E) Pausing of the ribosome at the tryptophan repeats in the leader sequence allows the nascent mRNA to form a stem-loop that acts as an intrinsic terminator of transcription. 1) Unlike proteins, RNA molecules can never form the 3-D structures and molecular pockets required for the specific binding of small molecules. If false, explain or provide a counterexample. A) True B) False,

Explanation / Answer

i think that D

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