1. What do channel proteins and carrier proteins have incommon? A.They mediate facilitated diffusion B. They transport...
Question:
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:
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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