Which of the following BEST describes attenuation of the trp operon? The ribosom
ID: 303026 • Letter: W
Question
Which of the following BEST describes attenuation of the trp operon?
The ribosome will stall at adjacent trp codons if tryptophan levels in the cell are low. A transcription termination sequence forms in the leader mRNA because the ribosome reaches a translation stop codon if tryptophan levels are high. High levels of tryptophan result in continued translation by the ribosome. The structural genes are not expressed if tryptophan levels in the cell are high. Regulation of trp operon expression by transcriptional repression by the trp repressor when tryptophan levels in the cell are high.Explanation / Answer
Regulation of trp operon expression by transcriptional repression by the trp repressor when tryptophan levels in the cell are high.
Explaination- Attenuation is a mechanism for reducing expression of the trp operon when levels of tryptophan are high in cell, it works by preventing completion of transcription. At high levels of tryptophan attenuation causes RNA polymerase to stop prematurely when it transcribing the trp operon. A short mRNA is transcribed which do not encode any tryptophan biosynthesis enzymes.
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