Which of the Following Structural Features of the Trp Leader

question 22

Multiple Choice

Which of the following structural features of the trp leader sequence, trpL, explains why transcription of the full trp operon is prevented even when the repressor is not bound to the operon?

• A)an A-rich region of the template strand acts as a factor-independent transcription terminator
• B)there is a stop codon present as the 15^th codon of the trpL sequence
• C)the ribosome is stalled at two adjacent Trp codons under conditions where Trp is low
• D)a charged tRNA^Trp binds to one of the adjacent Trp codons to block ribosomal movement
• E)none of the above

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