The net production of ATP in glycolysis is two molecules per glucose because
Correct answer: A. 2 ATP are invested early and 4 ATP are produced later
- A. 2 ATP are invested early and 4 ATP are produced later
- B. 4 ATP are invested and 2 ATP are produced
- C. only two of glucose's six carbons can be oxidised
- D. glycolysis occurs twice per glucose molecule
Explanation
Two ATP prime the pathway by phosphorylating glucose and its split products, and four ATP are later formed by substrate level phosphorylation, leaving a net gain of two. This investment phase is why glycolysis needs a small supply of ATP to begin with.
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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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