Which one of the following in glycolysis is a hydrogen carrier?
Correct answer: D. NAD
- A. ADP
- B. PGAL
- C. DPGA
- D. NAD
Explanation
Option D is correct because NAD (Nicotinamide adenine dinucleotide) functions as a hydrogen carrier in glycolysis. It accepts hydrogen atoms and electrons during the oxidation of glyceraldehyde-3-phosphate, converting into NADH. This is a critical step in energy extraction during glycolysis. The other options, ADP, PGAL, and DPGA, are involved in different roles within glycolysis or other metabolic pathways, but they do not function as hydrogen carriers.
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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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