Question

In photosynthesis, electron transport occurs at the beginning of the process. Where does electron transport occur during cellular respiration?

A) In the end of cellular respiration
B) In the beginning, just like photosynthesis
C) Electron transport doesn’t happen during cellular respiration
D) In the middle during the Krebs cycle

Please select the correct option that describes the timing of electron transport during cellular respiration.

Answer 1

Electron transport in cellular respiration occurs at the end of the process, on the inner membrane of the mitochondria.

Step-by-step explanation:

In cellular respiration, electron transport occurs at the final stage of the process. The correct timing of electron transport during cellular respiration is in the Electron Transport System (ETS), which is the last component involved in the process of cellular respiration. During the ETS, electrons are transferred from NADH and FADH2 through a series of reactions, ultimately driving the production of ATP via oxidative phosphorylation. This process occurs on the inner membrane of the mitochondria in eukaryotic cells. Hence, unlike photosynthesis where electron transport is the initial stage, in cellular respiration, it comes after both glycolysis and the Krebs cycle. Both photosynthesis and cellular respiration involve electron transport chains, but they occur in different organelles and at different stages of their respective processes. As such, the answer to the student's question is A) In the end of cellular respiration.