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when substrate-level phosphorylation occurs, it means that: group of answer choices adp is converted into atp by the addition of a phosphate group. nadh is converted into nad plus a proton. atp is converted into adp plus a phosphate group. nad is converted into nadh.



Answer :

When substrate-level phosphorylation occurs, it means that ADP is converted into ADP by the addition of a phosphate group.

ATP is adenosine tri-phosphate, while ADP is adenosine di-phosphate.

Substrate-level phosphorylation refers to the formation of ATP from ADP and a phosphorylated intermediate rather than from ADP and inorganic phosphate Pi, as in oxidative phosphorylation. The amount of ATP produced by glycolysis is relatively small.

Phosphorylation at the substrate level takes place in the cell cytoplasm (glycolysis) and mitochondria (Krebs cycle). It can occur under both aerobic and anaerobic conditions and is a faster but less efficient source of ATP compared to oxidative phosphorylation.

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