Overview of Cell Signaling

Part A

Which of these is a receptor molecule?

	D
	E
	A
	C
	B

Correct

This is a receptor molecule.

Part B

A signal transduction pathway is initiated when a _____ binds to a receptor.

	G protein
	calmodulin
	tyrosine kinase
	cyclic AMP
	signal molecule

Correct

The binding of a signal molecule to a receptor initiates a signal transduction pathway.

Part C

Which of these is a signal molecule?

	B
	C
	A
	E
	D

Correct

This is a signal molecule.

Part D

A signal molecule is also known as a(n) _____.

	protein
	key
	receptor
	initiator
	ligand

Correct

A ligand is a signal molecule.

Part E

Which of these is the second of the three stages of cell signaling?

	gene activation
	reception
	binding of a neurotransmitter to a plasma membrane receptor
	transduction
	cell response

Correct

Transduction is the second of the three stages of cell signaling.