Biological membranes are normally permeable to:
A. large, hydrophilic molecules
B. small, hydrophilic molecules
C. large, hydrophobic molecules
D. small, hydrophobic molecules
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Which of the following statements about the sodium-potassium pump is true?
A. It transports 3 sodium ions out of the cell in exchange for 2 potassium ions
B. It transports 2 sodium ions out of the cell in exchange for 3 potassium ions
C. It transports water directly out of the cell
D. It transports hydrogen ions out of the cell
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