Question

what role does cellular respiration play in the carbon cycle?
it removes co₂ from the atmosphere during glycolysis.
it removes co₂ from the atmosphere during the citric acid cycle.
it releases co₂ to the atmosphere during acetyl coa formation.
it releases co₂ to the atmosphere during electron transport.

Explanation:

Cellular respiration is a process that breaks down organic molecules (such as glucose). During acetyl - CoA formation (the link reaction between glycolysis and the citric acid cycle), pyruvate (from glycolysis) is oxidized. One of the products of this oxidation is \(CO_2\), which is released into the atmosphere.

• Glycolysis does not remove \(CO_2\) from the atmosphere. It is a process that breaks down glucose into pyruvate and produces a small amount of ATP and NADH.
• The citric acid cycle produces \(CO_2\) (as a by - product of the oxidation of acetyl - CoA), but it does not remove \(CO_2\) from the atmosphere.
• The electron transport chain is mainly involved in generating a large amount of ATP through oxidative phosphorylation and does not release \(CO_2\) (the \(CO_2\) is already released in previous steps like acetyl - CoA formation and the citric acid cycle).

Answer:

It releases \(CO_2\) to the atmosphere during acetyl CoA formation.