Multiple choice

The pyruvic acid formed during glycolysis is oxidized to CO2 and H2O in a cycle called

  1. calvin cycle

  2. nitrogen cycle

  3. hill reaction

  4. krebs cycle
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D Correct answer
Explanation

Pyruvic acid from glycolysis enters the mitochondrial matrix and is converted to acetyl-CoA, which then enters the Krebs cycle (citric acid cycle). In this cycle, acetyl-CoA is completely oxidized to CO2 and H2O, generating NADH, FADH2, and GTP/ATP. The Calvin cycle fixes CO2 in photosynthesis, Hill reaction is part of photosynthesis, and nitrogen cycle is a biogeochemical cycle.

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