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Attenuation

View the animation below, then complete the quiz to test your knowledge of the concept.






1In the trpL mRNA, the attenuator is located closest to what stem loop region?
A)region 1
B)region 2
C)region 3
D)region 4



2If transcription is occurring along, what stem loop structures are formed in the trpL mRNA?
A)1-2 and 3-4
B)1-3 only
C)2-4 only
D)1-3 and 2-4



3Which of the following occurs if tryptophan levels are high?
A)regions 2 and 3 form a stem loop structure
B)regions 3 and 4 form a stem loop structure
C)regions 1 and 4 form a stem loop structure
D)no stem loop structures are formed



4The process of attenuation in the trp operon turns off the operon when it is not needed by the cell.
A)True
B)False



5If regions 1 and 2, and 3 and 4, of the trpL mRNA form stem loops, the trpE gene will be transcribed.
A)True
B)False







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