Yes it is true that maximum ATP production during respiration occurs in the ETC .
The electron transport chain is where most of the ATP from glucose is produced. Although it is the only process in which oxygen is consumed directly by cells, this pathway is anaerobic in some prokaryotes. This route operates in the inner mitochondria membrane of eukaryotes. The ATPase enzyme and the ETS complexes are located on the inner mitochondria membrane. This process involves the transfer of electrons between molecules, which produces a chemical gradient that enables the synthesis of ATP.
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