Question

question 1 of 10
which does the electron transport chain do during cellular respiration?
a. provides energy that powers the formation of atp
b. uses carbon dioxide to produce glucose
c. makes energy carriers for the krebs cycle
d. breaks down glucose into pyruvate molecules

Explanation:

During cellular respiration, the electron transport chain (ETC) is the final stage. It uses the energy from electrons (carried by NADH and FADH₂) to pump protons (H⁺) across a membrane, creating a proton gradient. This gradient is used by ATP synthase to produce ATP. Option B is incorrect as the ETC does not use carbon dioxide to produce glucose (photosynthesis does that). Option C is wrong because energy carriers (NADH, FADH₂) are made in earlier stages (glycolysis, Krebs cycle), not by the ETC. Option D is for glycolysis (breaking down glucose into pyruvate), not the ETC.

Answer:

A. Provides energy that powers the formation of ATP