That statement is incorrect. While some ATP is produced in the cytoplasm through glycolysis, most of the ATP produced in a cell is made in the mitochondria.

Here's why:

* Glycolysis: This process occurs in the cytoplasm and produces a small amount of ATP (2 molecules per glucose molecule).

* Mitochondrial Respiration: This process occurs in the mitochondria and is much more efficient at ATP production. It involves the Krebs cycle and oxidative phosphorylation, which can yield up to 36-38 ATP molecules per glucose molecule.

Therefore, the mitochondria are the powerhouses of the cell, responsible for the majority of ATP production.