LIFE 102 Lecture Notes - Anaerobic Respiration, Atp Synthase, Mitochondrial Matrix
Document Summary
Electron transfer in the electron transport chain causes proteins to pump h+ from the mitochondrial matrix to the intermembrane space. H+ then moves back across the membrane, passing through channels in atp synthase. Atp synthase uses the exergonic flow of h+ to drive phosphorylation of atp. This is an example of chemiosmosis, the use of energy in a h+ gradient to drive cellular work. The energy stored in a h+ gradient across a membrane couples the redox reactions of the electron transport chain to atp synthesis. The h+ gradient is referred to as a proton motive force. An accounting of atp production by cellular respiration. During cellular respiration, most energy flows in this sequence: Glucose nadh electron transport chain proton-motive force atp. About 40% of the energy in a glucose molecule is transferred to atp during cellular respiration, making about 38 atp. Concept 9. 5: fermentation and anaerobic respiration enable cells to produce atp without the use of oxygen.
