Review the animation and answer the questions that follow to test your understanding.

1			Transcription is turned off by
			A)	induction
			B)	repression
			C)	activation
			D)	all of the above
2			In 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
3			In 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
4			Negative control occurs when a repressor is inactivated by an inducer.
			A)	True
			B)	False
5			An activator must react with its substrate before it can bind to DNA.
			A)	True
			B)	False