What is a by-product of cellular respiration?

What is a by-product of cellular respiration?

• A. Water
• B. Carbon dioxide gas
• C. Glucose
• D. Oxygen

Answer: (B)

Cellular respiration converts glucose into usable energy and generates waste as electrons are transferred through the steps. In this process carbon atoms from glucose are released as carbon dioxide at two key points: when pyruvate is converted to acetyl-CoA and again during the citric acid cycle. The overall equation shows carbon dioxide as one of the end products alongside water and energy. While water is also produced, carbon dioxide is the notable gaseous by-product that organisms typically exhale, signaling its role as a waste product of the pathway. Oxygen is consumed as the reactant, and glucose is the starting fuel, not a by-product.

Cellular respiration converts glucose into usable energy and generates waste as electrons are transferred through the steps. In this process carbon atoms from glucose are released as carbon dioxide at two key points: when pyruvate is converted to acetyl-CoA and again during the citric acid cycle. The overall equation shows carbon dioxide as one of the end products alongside water and energy. While water is also produced, carbon dioxide is the notable gaseous by-product that organisms typically exhale, signaling its role as a waste product of the pathway. Oxygen is consumed as the reactant, and glucose is the starting fuel, not a by-product.