Which substance enters and leaves a mitochondrion during aerobic respiration?
Correct answer: A. Pyruvate enters and ATP leaves
- A. Pyruvate enters and ATP leaves
- B. Glucose enters and carbon dioxide leaves
- C. Oxygen enters and water leaves
- D. NADH enters and FAD leaves
Explanation
During aerobic respiration, pyruvate produced from glycolysis enters the mitochondria, where it is converted into acetyl-CoA, which enters the citric acid cycle. ATP, the energy currency of the cell, is generated within the mitochondria during oxidative phosphorylation and exits the mitochondria to be utilized by the cell. Other substances, like oxygen, also enter the mitochondria, while carbon dioxide and water are produced as byproducts inside the mitochondria.The correct answer is that pyruvate enters and ATP leaves, as this highlights the critical inputs and outputs of the mitochondria in the context of aerobic respiration.
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About Bioenergetics
Cellular respiration explains how cells release energy from glucose through glycolysis, the link reaction, Krebs cycle and electron transport chain. It includes ATP production, substrate-level and oxidative phosphorylation, aerobic versus anaerobic respiration, and the roles of mitochondria, oxygen and fermentation in energy transfer.
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