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Inside the mitochondria is where most of your ATP are created, but some ATP can be made in the cytoplasm through a process called substrate-level phosphorylation. This is a process of forming ATP by the physical addition of a phosphate group to ADP.
Substrate-level phosphorylation means phosphorylation of ADP to ATP without involvement of mitochondrial electron transport chain and ATP synthase. Substrate-level phosphorylation occurs at two steps in glycolysis and at one step in TCA cycle. Substrate phosphorylation means phosphorylation of a substrate into its phosphate derivative in presence of enzyme kinase, e.g. phosphorylation of glucose to glucose-6-phosphate in presence of enzyme hexokinase.