Cristea of mitochondria are the sites of:
Correct answer: A. Electron transport chain
- A. Electron transport chain
- B. Photophosphorylation
- C. Krebs cycle
- D. Glycolysis
Explanation
The correct answer is A, the electron transport chain, which occurs on the cristae of the mitochondria. These folds provide a large surface area for the chain's protein complexes to facilitate ATP production. Photophosphorylation (Option B) occurs in chloroplasts, not mitochondria. The Krebs cycle (Option C) takes place in the mitochondrial matrix, not the cristae. Glycolysis (Option D) occurs in the cytoplasm, outside of the mitochondria.
This question appeared on the ETEA MDCAT 2013 paper, which you can sit online with every answer explained.
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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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