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The Tryptophan Repressor

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






1The trp operon consists of ________ genes that encode tryptophan biosynthesis enzymes.
A)one
B)two
C)three
D)four
E)five



2In the absence of tryptophan, the trp repressor is
A)active and can bind to the operator.
B)active and cannot bind to the operator.
C)inactive and cannot bind to the promoter.
D)inactive and can bind to the operator.
E)inactive and cannot bind to the operator.



3In the presence of tryptophan, tryptophan binds to the
A)operator.
B)promoter.
C)RNA polymerase.
D)trp genes.
E)trp repressor.



4In the presence of tryptophan, transcription of the trp operon is on.
A)True
B)False



5The trp repressor is a helix-turn-helix regulator protein.
A)True
B)False







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