The first reaction of the Krebs cycle is the combination of acetyl CoA with
Correct answer: B. oxaloacetic acid
- A. citric acid
- B. oxaloacetic acid
- C. succinic acid
- D. malic acid
Explanation
The two carbon acetyl group is transferred to the four carbon oxaloacetic acid to give the six carbon citric acid, which is why the pathway is also called the citric acid cycle. Citric acid is the product of that step, not the reactant, which is what makes it the tempting answer. Oxaloacetate is regenerated at the end of each turn, so a small amount keeps the cycle running indefinitely.
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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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