Which of the Following Descriptions of Movement of Molecules Across

question 12

Multiple Choice

Which of the following descriptions of movement of molecules across the plasma membrane is correct?

• A) if two similar molecules can both combine with the same carrier, the presence of one of these molecules decreases the rate of entry of the other.
• B) in simple diffusion, the rate of transport of a molecule is directly proportional to the molecule's extracellular concentration.
• C) when a carrier becomes saturated, the maximum rate of transport is reached.
• D) two of these answers.
• E) all of these answers.

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