Question

the cftr transport protein moves chloride ions out of a cell by active transport. this is an example of
a reaction that produces atp.
an oxidation reaction.
a reduction reaction.
a reaction that requires atp.
equilibrium.

Explanation:

Active transport is a process that moves substances against their concentration gradient. This process requires energy, which is provided by ATP (adenosine triphosphate). The CFTR transport protein moving chloride ions out of a cell by active transport means this process needs ATP.

• "A reaction that produces ATP" is incorrect because active transport uses ATP, not produces it.
• "An oxidation reaction" and "a reduction reaction" are types of chemical reactions involving electron transfer, not related to active transport's energy requirement.
• "Equilibrium" is a state where concentrations are equal, and active transport moves substances away from equilibrium, so this is incorrect.

Answer:

D. a reaction that requires ATP.