Massachusetts Tests for Educator Licensure (MTEL) Practice Test

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What is produced as a waste product during cellular respiration?

Glucose
Carbon dioxide
Oxygen
Sodium ions

The correct answer is: Carbon dioxide

During cellular respiration, organisms convert glucose and oxygen into energy (ATP), with carbon dioxide and water being produced as waste products. Specifically, the process involves the breakdown of glucose to release energy, during which carbon atoms from the glucose molecule combine with oxygen to form carbon dioxide. This carbon dioxide is then released from the cells and eventually expelled from the organism, making it a waste product. Glucose is utilized as the primary fuel source in this metabolic process rather than being a waste product, and oxygen is consumed during respiration, not produced as a waste. Sodium ions also play roles in various cellular processes, but they are not a direct byproduct of cellular respiration. The focus on carbon dioxide emphasizes its significance in the respiration cycle and its role in maintaining homeostasis in organisms.