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

1	An example of a second messenger is
	A)	AMP.
	B)	ATP.
	C)	cAMP.
	D)	cATP.
	E)	adenylyl cyclase.
2	Arrange the following in the proper order in which they occur during signal amplification. 1. Activation of protein kinase 2. Activation of G protein 3. Activation of adenylyl cyclase
	A)	1, 2, 3
	B)	2, 1, 3
	C)	2, 3, 1
	D)	3, 2, 1
	E)	3, 1, 2
3	Which of the following statements about signal amplification is TRUE?
	A)	A single cell surface receptor can activate only one G protein.
	B)	A single cell surface receptor can activate only two G proteins.
	C)	A single cell surface receptor can activate many G proteins.
	D)	It takes two cell surface receptors to activate a single G protein.
	E)	It takes many surface receptors to activate a single G protein.
4	Most signaling molecules are found in low concentrations inside the cytoplasm.
	A)	True
	B)	False
5	Cell surface receptors may be enzyme-linked or G protein-linked.
	A)	True
	B)	False