Read the following statements about aerobic respiration:
1. Glycolysis occurs in the mitochondria.
2. Kreb's cycle occurs in the mitochondrial matrix.
3. The final electron acceptor in aerobic respiration is oxygen.
Which of the above statements are correct?
Show answer & explanation
Correct answer: B
Explanation
The correct answer is Option 2 i.e. Only 2 and 3 are correct.
Statement 1 is incorrect: Glycolysis occurs in the cytoplasm (cytosol) of the cell, not the mitochondria. It is the initial stage where glucose is broken down into pyruvate.
Statement 2 is correct: The Kreb's cycle (Citric Acid Cycle) takes place within the mitochondrial matrix. This is where acetyl-CoA is oxidized to produce CO2, ATP, NADH, and FADH2.
Statement 3 is correct: In the Electron Transport Chain, molecular oxygen (O2) acts as the final electron acceptor, combining with electrons and protons to form water (H2O).