The reactions of the Krebs cycle take place in the
Correct answer: D. matrix of the mitochondrion
- A. cytoplasm
- B. outer membrane of the mitochondrion
- C. intermembrane space
- D. matrix of the mitochondrion
Explanation
The soluble enzymes of the cycle sit in the mitochondrial matrix, while the electron transport chain that the cycle feeds is embedded in the inner membrane. Glycolysis alone happens outside the mitochondrion in the cytoplasm.
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About Cellular Respiration
Cellular respiration releases energy from glucose through glycolysis, the link reaction, the Krebs cycle and the electron transport chain, producing ATP. The pathway differs in oxygen availability: aerobic respiration uses oxygen and yields more ATP, while anaerobic respiration produces much less ATP and forms lactic acid in muscles or ethanol and carbon dioxide in yeast.
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