A) Which of the following is a reactant of cellular respiration? (1 point)
water.
oxygen.
carbon dioxide.
energy
oxygen.
The correct reactant of cellular respiration is oxygen.
To determine which of the given options is a reactant of cellular respiration, we need to understand the process of cellular respiration.
Cellular respiration is the process by which cells obtain energy from glucose molecules. It occurs in the mitochondria of cells and involves a series of chemical reactions. The reactants of cellular respiration are glucose (a sugar molecule) and oxygen.
Looking at the options provided:
- Water (H2O) is not a direct reactant of cellular respiration. Although water is involved in some metabolic processes in the body, it is not one of the primary reactants in cellular respiration.
- Oxygen (O2) is indeed a reactant of cellular respiration. It is necessary for the final step of cellular respiration, where glucose is broken down and converted into energy.
- Carbon dioxide (CO2) is not a reactant of cellular respiration. It is produced as a waste product during the process, rather than being a reactant.
- Energy is not a reactant itself but rather a product generated by cellular respiration. The process of cellular respiration releases energy in the form of ATP (adenosine triphosphate) molecules.
Therefore, the correct answer is: oxygen.