Which of the Following BEST Describes Attenuation of the Trp

question 3

Multiple Choice

Which of the following BEST describes attenuation of the trp operon?

• A) The ribosome will stall at adjacent trp codons if tryptophan levels in the cell are low.
• B) High levels of tryptophan result in continued translation by the ribosome.
• C) A transcription termination sequence forms in the leader mRNA because the ribosome reaches a translation stop codon if tryptophan levels are high.
• D) The structural genes are not expressed if tryptophan levels in the cell are high.
• E) Regulation of trp operon expression by transcriptional repression by the trp repressor when tryptophan levels in the cell are high.

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