Bio-Chemistry (M.Phil./Ph.D.) 2014 Panjab University Entrance Exam With Answers

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Why does the ribosome stall on region 1 during attenuation ? 

A: Translation of this region requires tRNAtrp.
B: High levels of tryptophan interfere with ribosome functionary
C: Low levels of tryptophan lead to intrinsic termination
D: Binding of the repressor proteins prevents further translation.

The answer is: A