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Amamzingphil
This depends on whether you are a eukaryote, bacteria or archaea. In eukaryotes, the electron transport chain components are on the mitochondrial membrane. In bacteria and archaea, since there are no membrane-enclosed compartments, they are on the cellular membrane.

Answer;

-The electron transport chain takes place in and across the inner membrane of the mitochondrion.

Explanation;

-The electron transport chain is a series of electron transporters embedded in the inner mitochondrial membrane that shuttles electrons from NADH and FADH2 to molecular oxygen. In the process, protons are pumped from the mitochondrial matrix to the intermembrane space, and oxygen is reduced to form water.

-It functions to make energy in the form of ATP, it is the third phase of cellular respiration.

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