AP BIOLOGY

Detailed explanation-1: -Electron transport chain is the process which produces ATP in the final steps of cellular respiration, occurs in the inner mitochondrial membrane. The mitochondrion has an outer membrane and an inner membrane with folds called as cristae .

Detailed explanation-2: -The ETC is a collection of proteins bound to the inner mitochondrial membrane and organic molecules, which electrons pass through in a series of redox reactions, and release energy. The energy released forms a proton gradient, which is used in chemiosmosis to make a large amount of ATP by the protein ATP-synthase.

Detailed explanation-3: -For aerobic respiration, the electron transport chain or “respiratory chain” is embedded in the inner membrane of the mitochondria (see figure below). The FADH2 and NADH molecules produced in glycolysis and the Krebs Cycle, donate high-energy electrons to energy carrier molecules within the membrane.

Detailed explanation-4: -At the inner mitochondrial membrane, a high energy electron is passed along an electron transport chain. The energy released pumps hydrogen out of the matrix space. The gradient created by this drives hydrogen back through the membrane, through ATP synthase.

Detailed explanation-5: -The electron transport chain activity takes place in the inner membrane and the space between the inner and outer membrane, called the intermembrane space.