Energy and Metabolism

ID #2212

The protein complexes of the electron transport chain are found in the inner mitochondiral membrane and not the plasma membrane right? The plasma membrane is merely for defense and plays no role whatsoever in metabolism correct? It seems easy to get those two mixed up.

It depends on what organism you are looking at. In eukaryotes, yes, the protein complexes of the ETC are located in the inner mitochondrial membrane and the plasma membrane is not involved in metabolism. In bacteria, however, there are no mitochondria so the complexes of the ETC are located in the plasma membrane. Even though bacteria lack mitochondria they can still perform oxidative phosphorylation. 

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