Which of the Following Is True Regarding the Regulation of the Trp

question 43

Multiple Choice

Which of the following is true regarding the regulation of the trp operon?

• A) trpR mutants that lack functional repressor have a tenfold elevated rate of synthesis of the tryptophan biosynthetic enzymes in the presence of tryptophan.
• B) Tryptophan is an inducer of the trp operon.
• C) trpL deletion mutants in which there is no 162-nucleotide-long leader sequence in the mRNA result in relief of repression and derepression of the trp operon.
• D) Premature termination of the trp operon occurs in the presence of tryptophan charged tRNAt?p.
• E) In the presence of tryptophan, the ribosome cannot translate past the Trp codons to the leader-peptide termination codon.

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