Which is a reactant of cellular respiration?

Which is a reactant of cellular respiration?

• A. Glucose
• B. Oxygen
• C. Glucose and Oxygen
• D. Water

Answer: (C)

In cellular respiration, the substances that start the process and are used up to release energy are glucose and oxygen. Glucose provides the chemical energy by being oxidized, while oxygen acts as the final electron acceptor in the electron transport chain, allowing energy to be captured as ATP. Because both are consumed during the reaction, they are the reactants. The process ultimately produces carbon dioxide and water as products, along with ATP. Water is formed, not used, which is why water is not a reactant. So glucose and oxygen are the substances that act as reactants.

In cellular respiration, the substances that start the process and are used up to release energy are glucose and oxygen. Glucose provides the chemical energy by being oxidized, while oxygen acts as the final electron acceptor in the electron transport chain, allowing energy to be captured as ATP. Because both are consumed during the reaction, they are the reactants. The process ultimately produces carbon dioxide and water as products, along with ATP. Water is formed, not used, which is why water is not a reactant. So glucose and oxygen are the substances that act as reactants.