1. What do channel proteins and carrier proteins have incommon?

	A.They mediate facilitated diffusion
	B.	They transport substances down their concentration gradients
	C.	They require energy
	D.	Both A and B
	E.	A, B, and C

2. Which of the following correctly states a majorDIFFERENCE between channels and carrier proteins?

	A.	Channels do require energy; carrier proteins do NOT requireenergy.
	B.	Channels generally mediate diffusion of ions, while carrierproteins generally mediate diffusion of larger polar molecules.
	C.	Channels do NOT require energy; carrier proteins do requireenergy.
	D.	Channels speed up diffusion, while carrier proteins slowdiffusion down.
	E.	Channels are fixed in the membrane; carrier proteins physicallycarry their substances by diffusing across the membrane.

3. Match each of the following descriptions to the modeof transport that it describes:

	Movement of a substance up its concentration gradient by aprotein complex that derives its energy from ATP.
	Movement of a substance down its concentration gradient acrossthe membrane through a protein complex that has evolved totransport that substance specifically.
	Movement of a substance down its concentration gradient directlythrough the membrane.
	Movement of a substance up its concentration gradient by aprotein complex using the energy derived from another substancediffusing down its concentration gradient.

A.	Facilitated diffusion
B.	Primary active transport
C.	Simple diffusion
D.	Secondary active transport

4. Thesodium-potassium (Na⁺-K⁺) pump, alsoknownas the sodium-potassium (Na⁺-K⁺) ATPase,transports Na⁺_______ and K⁺ ______the cell.

A. Into; into

B. Into; out of

C. Out of; into

D. Out of; out of