Question

where does electron transfer chainreactiin takes place

Answer 1

The electron transport chain for respiration occurs in the inner membrane layer of the mitochondria. In eukaryotes the ETC is located within mitochondria. Prokaryotes have ETC associated with inner plasma membrane.

Answer 2

In eukaryotes, an important electron transport chain is found in the inner mitochondrial membrane where it serves as the site of oxidative phosphorylation through the action of ATP synthase. It is also found in the thylakoid membrane of the chloroplast in photosynthetic eukaryotes