BI110 Chapter Notes - Chapter 7: Inner Mitochondrial Membrane, Electrochemical Gradient, Cellular Respiration
Document Summary
Complete oxidation of glucose in rst three stages of cellular respiration produces two kinds of reduced electron carriers (nadh and fadh2) Energy stored in them is used to synthesize atp. Energy in these electron carriers is released in a series of redox reactions occurring as electrons pass through a chain of protein complexes in imm to oxygen reduced to water. Energy released by these redox reactions is not converted directly into chemical energy of atp. Passage of electrons is coupled to transfer protons across the inner mitochondrial membrane making a concentration and charge gradient. Electrochemical gradient provides a source of potential energy then used to drive the synthesis of atp. Electrons donated by nadh and fadh2 are transported along four large protein complexes that form electron transport chain. These membrane proteins are embedded in mitochondrial inner membrane. Inner mitochondrial membrane contains one of the highest concentration of proteins found in eukaryotic membrane. Electrons enter at complex 1 or 2.