Question

The actual transport of protons by the proton pump is mediated by a transmembrane protein which undergoes a change in its

A. conformation.

B. amino acid sequence.

C. net charge.

D. solubility.

E. immunity.

Answer 1

The transport of protons by a proton pump is mediated by a change in the conformation of a transmembrane carrier protein during active transport.

Step-by-step explanation:

The actual transport of protons by the proton pump is mediated by a transmembrane protein which undergoes a change in its conformation. This process involves carrier proteins that facilitate the movement of substances across cell membranes. Carrier proteins undergo allosteric changes, meaning their shape changes when they bind to the substance they are designed to carry. During active transport, which requires energy often in the form of ATP, these proteins shift their conformation to move substances against concentration gradients. In the case of a proton pump, the movement is typically tied to the accumulation of protons against an electrochemical gradient.

Answer 2

The correct answer is A) Conformation.

Step-by-step explanation:

Proton pumps are usually molecules that are able to change its conformation in order to transport molecules from one side to the other. The amino acid sequence cannot be changed, because it would change completely the function of the protein. For example, the sodium/potassium pump changes its conformation in order to move these molecules from one side of the membrane to the other.