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

1	The trp operon consists of ________ genes that encode tryptophan biosynthesis enzymes.
	A)	one
	B)	two
	C)	three
	D)	four
	E)	five
2	In 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.
3	In the presence of tryptophan, tryptophan binds to the
	A)	operator.
	B)	promoter.
	C)	RNA polymerase.
	D)	trp genes.
	E)	trp repressor.
4	In the presence of tryptophan, transcription of the trp operon is on.
	A)	True
	B)	False
5	The trp repressor is a helix-turn-helix regulator protein.
	A)	True
	B)	False