Which of the following membrane activities requires energy from ATP?
A) facilitated diffusion of chloride ions across the membrane through a chloride channel
B) movement of water into a cell
C) movement of Na+ ions from a lower concentration in a mammalian cell to a higher concentration in the extracellular fluid
D) movement of glucose molecules into a bacterial cell from a medium containing a higher concentration of glucose than that inside the cell
E) 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 energy from ATP because it is going against the concentration gradient. This process is called active transport.

Answer: D
 Movement of glucose molecules into a bacterial cell from a medium containing a higher concentration of glucose than that inside the cell requires energy from ATP because it is going against the concentration gradient. This process is also called active transport.

The other options, facilitated diffusion (A), movement of water (B), and movement of carbon dioxide (E), do not require energy from ATP because they are moving down the concentration gradient, from an area of high concentration to an area of low concentration.

Which of the Following Membrane Activities Requires Energy from ATP