Which of the following statements is TRUE?
a. As the concentration of CO2 increases inside the cell, the transport out of the cell, across the cell membrane, reaches a maximal plateau.
b. Polar vitamins can cross the cell by potocytosis.
c. Glucose crosses the cell membrane via a channel.
d. Secondary active transport proteins bind and hydrolyze ATP.
Answer: b. Polar vitamins can cross the cell by potocytosis.
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