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Regulatory Proteins: Regulation by Repression (Quiz 2)

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






1Transcription is turned off by
A)induction
B)repression
C)activation
D)all of the above



2In regulation by repression
A)a sugar, such as lactose, acts as an inducer and combines with the repressor to prevent transcription
B)an inducer activates the activator so that it binds to DNA and prevents transcription
C)an amino acid activates the repressor so that the repressor binds to the operator and prevents transcription
D)an amino acid binds to the operator, blocking the repressor, allowing transcription to proceed



3In regulation by induction
A)an inducer inactivates the repressor so transcription can proceed
B)an inducer inactivates the repressor so transcription is stopped
C)an inducer activates the repressor so transcription can proceed
D)an inducer activates the repressor so transcription is stopped



4Negative control occurs when a repressor is inactivated by an inducer.
A)True
B)False



5An activator must react with its substrate before it can bind to DNA.
A)True
B)False







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