AP BIOLOGY

Detailed explanation-1: -The electron transport chain is a series of four protein complexes that couple redox reactions, creating an electrochemical gradient that leads to the creation of ATP in a complete system named oxidative phosphorylation. It occurs in mitochondria in both cellular respiration and photosynthesis.

Detailed explanation-2: -The electron transport chain is a series of proteins and organic molecules found in the inner membrane of the mitochondria.

Detailed explanation-3: -Electron transport chain (ETC) occurs in the inner mitochondrial membrane, where the OXPHOS takes place through the action of ATP synthase, [37].

Detailed explanation-4: -The electron transport chain activity takes place in the inner membrane and the space between the inner and outer membrane, called the intermembrane space.

Detailed explanation-5: -Consequently, the inner mitochondrial membrane is the functional barrier to the passage of small molecules between the cytosol and the matrix and maintains the proton gradient that drives oxidative phosphorylation.