Question

How many hydrogen ions are being transported due to NADH?

A) 2

B) 3

C) 4

D) 6

Answer 1

Each NADH molecule transports three hydrogen ions across the mitochondrial membrane through the ETC, so the answer is B) 3.

Step-by-step explanation:

Each molecule of NADH transports three hydrogen ions (protons) across the mitochondrial membrane via the electron transport chain (ETC). When NADH donates electrons to the ETC at Complex I, these electrons move through the chain, inducing Complex I and other components to pump protons from the matrix into the intermembrane space. This contributes to the proton gradient that powers ATP synthesis. Therefore, the correct answer to the question is B) 3.