Biology · Cellular Respiration and Metabolism
With reference to glucose metabolism and cellular respiration, consider the following statements: Statement 1: The conversion of succinate to fumarate in the TCA cycle is unique because it is the only step catalyzed by an enzyme embedded in the inner mitochondrial membrane and directly links the TCA cycle to the electron transport chain. Statement 2: Oxidative phosphorylation is the only stage of cellular respiration where oxygen is directly consumed, and all ATP generated in this stage is produced by substrate-level phosphorylation. Statement 3: In glycolysis, the enzyme phosphofructokinase-1 (PFK-1) is allosterically inhibited by high concentrations of ATP and citrate, making it a key regulatory point for both glycolysis and the TCA cycle. Which of the statements given above are correct?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1All statements are correct
- 2Statement 1 and Statement 3 only✓
- 3Statement 3 only
- 4Statement 1 and Statement 2 only
Correct answer
Statement 1 and Statement 3 only
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