Which of the following statements is false, with regard to the transport of non-lipid-soluble substances across cell membranes?
a. Both active and passive transport mechanisms exist to move non-lipid-soluble substances across membranes.
b. Diffusion of substances across the cell membrane, from an area of high concentration to an area of low concentration, is considered a passive transport mechanism.
c. Attachment of a non-lipid-soluble molecule to a carrier protein is considered an active transport mechanism.
d. Active transport mechanisms involve energy expenditure on the part of the cell.
e. The sodium-potassium transporter protein is an example of an active transport mechanism.
Answer: C
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