Which of the following membrane activities requires energy from ATP hydrolysis?
A) Facilitated diffusion of chloride ions across the membrane through a chloride channel.
B) Movement of Na⁺ ions from a lower concentration in a mammalian cell to a higher concentration in the extracellular fluid.
C) Movement of glucose molecules into a bacterial cell from a medium containing a higher concentration of glucose than inside the cell.
D) Movement of carbon dioxide out of a paramecium.

Question

Quizplus · Accepted Answer

Movement of Na⁺ ions from a lower concentration in a mammalian cell to a higher concentration in the extracellular fluid requires ATP hydrolysis as it is against the concentration gradient. This type of movement is known as active transport. The other options listed - facilitated diffusion, simple diffusion, and movement of molecules down their concentration gradient - do not require ATP hydrolysis.

Which of the Following Membrane Activities Requires Energy from ATP