Small molecules, such as water and many ions, cross the membrane without assistance from the cell. This movement is called ________ and requires NO energy expenditure by the cell
A) passive transport
B) active transport
C) facilitated diffusion
D) None of the listed responses is correct.
A
Explanation:
B) Active transport requires energy from the cell.
C) Although facilitated diffusion does not require any energy, it does require assistance of a protein carrier.
D) One of the listed responses is correct.
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