This preview shows pages 1–2. Sign up to view the full content.
This preview has intentionally blurred sections. Sign up to view the full version.View Full Document
Unformatted text preview: Electron Transport Chain, Phosphorylation After the Krebs cycle is completed, oxygen enters the respiration pathway as the electron acceptor at the end of the electron transport chain. The oxidation takes place in a series of steps, like the electron chain of photosynthesis, but with different transport molecules. Many of the latter are cytochromes (proteins with an iron-containing porphyrin ring attached) where the electron exchanges take place on the iron atoms. Others are iron- sulfur proteins with iron again the exchange site. Three complexes of carriers are embedded together with proteins in the inner mitochondrial membrane where they assist in the chemiosmotic production of ATP (see below). The most abundant electron carrier, coenzyme Q (CoQ) , carries electrons and hydrogen atoms between the others. The transport chain often is likened to a series of magnets, each stronger than the last, which pull...
View Full Document