The Formation of 1+2 and 3+4 Secondary Structures of 5

question 66

Multiple Choice

The formation of 1+2 and 3+4 secondary structures of 5' UTR region mRNA from the trp operon is triggered when:

• A) the tryptophan level inside the bacterial cell is extremely low.
• B) the tryptophan level inside the bacterial cell is high.
• C) the repressor protein fails to bind to the operator.
• D) there is a spontaneous mutation introduced into the 5' UTR.
• E) the structural gene transcription within the trp operon gets initiated.

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