Question

Why are proteins involved in active transport often called "pumps"?

• A. They use energy to move a substance against its concentration gradient.
• B. They use energy to move a substance with its concentration gradient.
• C. They use energy to bind the substance to the carrier.
• D. They use energy to dislodge the substance from the carrier.

Answer 1

Answer: (A)

Correct answer is (a) They use energy to move a substance against its concentration gradient.