Which of the following requires the use of energy and the help of transport proteins to move a molecule across a cell membrane?
A. Facilitated diffusion
B. Passive transport
C. Active transport
D. Osmosis diffusion

C. Active transport

Explanation:

Active transport is the movement of ions or molecules across a cell membrane into a region of higher concentration, assisted by enzymes and requiring energy.

The rest of these options do not require energy because they are passive.

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