Question

During which phase of cellular respiration is carbon dioxide released?

A) Glycolysis
B) Krebs cycle
C) Electron transport chain
D) Fermentation

Answer 1

Carbon dioxide is released during the Krebs cycle, the second stage of cellular respiration, when Acetyl CoA is oxidized. This step follows glycolysis and precedes the electron transport chain.option B is correct answer.

Step-by-step explanation:

The phase of cellular respiration during which carbon dioxide is released is the Krebs cycle (B). Here's a step-by-step explanation:

1. Glycolysis occurs first, where a glucose molecule is split into two pyruvate molecules, yielding a small amount of ATP and NADH.
2. Pyruvate is then oxidized to Acetyl CoA, which enters the Krebs cycle within the mitochondria of the cell.
3. During the Krebs cycle, Acetyl CoA is fully oxidized, and several key events occur including the release of carbon dioxide, the production of more NADH, FADH2, and a limited amount of ATP.

Finally, the electron transport chain operates in the inner membrane of the mitochondrion, using the NADH and FADH2 produced from both glycolysis and the Krebs cycle to create a significant amount of ATP.