Question

1. which of the following would most likely require atp?

a. water entering a cell
b. oxygen diffusing across a membrane
c. glucose moving against its concentration gradient
d. carbon dioxide diffusing out of a cell

Explanation:

• Option a: Water entering a cell is osmosis (passive transport), no ATP needed.
• Option b: Oxygen diffusion is simple diffusion (passive), no ATP.
• Option c: Moving against concentration gradient is active transport, which requires ATP (energy).
• Option d: Carbon dioxide diffusion is simple diffusion (passive), no ATP.

Answer:

c. Glucose moving against its concentration gradient