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: -The electron transport chain consists of four multisubunit protein complexes located in the inner mitochondrial membrane. The proteins in each complex oxidize NADH and/or FADH2 and carry the electrons to the next acceptors.

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: -Where do the electrons moving along the inner membrane end up ? They join with 4 H+ and O2 to form water molecules.