The plasma membranes of some plant cells use transport proteins to move protons out of the cell against their concentration gradient. This is an example of:
A)facilitated diffusion.
B)passive transport.
C)endocytosis.
D)active transport.
E)simple diffusion

Question

Quizplus · Accepted Answer

Moving protons against their concentration gradient requires energy input, which is provided by ATP in active transport. Therefore, the plasma membranes of some plant cells using transport proteins to move protons out of the cell against their concentration gradient is an example of active transport.

The Plasma Membranes of Some Plant Cells Use Transport Proteins