Question

Carbon dioxide (CO2) is released during which of the following stages of cellular respiration?

a) Glycolysis
b) Krebs cycle
c) Electron transport chain
d) Fermentation

Answer 1

Carbon dioxide (CO2) is released during the Krebs cycle and the electron transport chain stages of cellular respiration.

Step-by-step explanation:

Carbon dioxide (CO2) is released during the following stages of cellular respiration:

1. Krebs cycle: The Krebs cycle, also known as the citric acid cycle, occurs in the mitochondria and is responsible for fully oxidizing the two three-carbon molecules (pyruvate) produced in glycolysis into carbon dioxide.
2. Electron transport chain: In the final stage of cellular respiration, the electrons extracted from food move down the electron transport chain in the inner membrane of the mitochondrion. As the electrons move down the ETC and finally to oxygen, they lose energy. This energy is used to phosphorylate AMP to make ATP, and carbon dioxide is one of the byproducts.

Therefore, carbon dioxide is released during the Krebs cycle and the electron transport chain stages of cellular respiration.