What is equivalent to half glucose molecule that has been oxidized to the extent of losing two electrons as hydrogen atoms:
Correct answer: D. Pyruvate
- A. G3P
- B. 3PGAL
- C. 3-PG
- D. Pyruvate
Explanation
Pyruvic acid (pyruvate) is the end product of glycolysis and does not enter the Krebs cycle directly. The pyruvate (a 3-carbon molecule) is first changed into a 2-carbon acetic acid molecule. One carbon is released as CO2 coenzyme-A (CoA) to form acetyl CoA (Active acetate). In addition, more hydrogen atoms are transferred to NAD.
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About Bioenergetics
Cellular respiration explains how cells release energy from glucose through glycolysis, the link reaction, Krebs cycle and electron transport chain. It includes ATP production, substrate-level and oxidative phosphorylation, aerobic versus anaerobic respiration, and the roles of mitochondria, oxygen and fermentation in energy transfer.
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