Reception

Part A

Which of these receptors is NOT a membrane receptor?

	D
	A
	B
	C
	E

Correct

This receptor is not associated with the plasma membrane.

Part B

Which of these is a G-protein-linked receptor?

	C
	A
	B
	D
	E

Correct

This is a G-protein-linked receptor.

Part C

Which of these is a receptor tyrosine kinase?

	E
	B
	C
	A
	D

Correct

This is a receptor tyrosine kinase.

Part D

Which of these is an ion-channel receptor?

	A
	B
	E
	D
	C

Correct

This receptor does form a channel.

Part E

The binding of signal molecules to _____ results in the phosphorylation of tyrosines.

	B
	E
	D
	C
	A

Correct

The binding of signal molecules to tyrosine-kinase receptors activates tyrosine-kinase enzymes, which phosphorylate tyrosines.

Part F

Which of these receptor molecules would allow Na⁺ to flow into the cell?

	A
	C
	E
	D
	B

Correct

This is an ion-channel receptor.

Part G

Which of these extracellular signal molecules could diffuse through a plasma membrane and bind to an intracellular receptor?

	estrogen
	glycerol
	starch
	cellulose
	glucose

Correct

Nonpolar molecules can diffuse through the plasma membrane and bind to intracellular receptors.

Part H

A(n) _____ is an example of a signal molecule that can bind to an intracellular receptor and thereby cause a gene to be turned on or off.

	ion
	nucleic acid
	steroid
	carbohydrate
	protein

Correct

Steroids bind to intracellular receptors, which can then bind to, and regulate, the expression of genes.

Part I

_____ is a signal molecule that binds to an intracellular receptor

	C
	D
	B
	E
	A

Correct

Steroids are nonpolar and can diffuse through the plasma membrane.

Part J

Thyroid hormones bind to _____ receptors.

	plasma membrane ion-channel
	G-protein-linked
	intracellular
	tyrosine-kinase
	steroid

Correct

Thyroid hormones are able to pass through the plasma membrane.