Which of the following events occur when E. coli is straved for tryptophan ?
  • a)
    The ribosome translates the leader peptide completely
  • b)
    Transcription reads through attenuator into trp EDCBA
  • c)
    Tryptophanyl tRNA is not formed
  • d)
    A stem loop structure involving regions 3 and 4 is formed at attenuator site.
Correct answer is option 'B,C'. Can you explain this answer?
Related Test: Molecular Biology MCQ 1

IIT JAM Question

REETA JAIN
May 15, 2020
In the absence of tryptophan, the ribosomes would stall at trp codons in the leader sequence present in region1. This allows region 2 and 3 to pair and from an anti-termination loop, which allows transcription to continue into trp EDCBA genes, which code the enzymes for tryptophan synthesis. Since tryptophan is not present, so tryptophanyl- tRNA would not be formed, hence options b and c are  correct.

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