Citric acid is formed in the Krebs cycle when acetyl-CoA joins with a large molecule called oxaloacetic acid. This reaction creates citric acid (or citrate) as the first step of the cycle.
In the Krebs cycle, how is citric acid formed? (1 point)
• Pyruvic acid molecules are broken down by an acetyl group.
• Enzymes combine hydrogen ions, oxygen, and electrons.
• Acetyl-CoA joins with a large molecule called oxaloacetic acid.
• Carbon dioxide bonds with a chain of coenzyme A.
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