The net production of ATP in glycolysis is two molecules per glucose because
- 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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