BIOL 1090 Lecture Notes - Lecture 21: Potential Energy, Cytosol, Cell Membrane

• School: University of Guelph
• Department: Biology
• Course: BIOL 1090
• Professor: Andrew Bendall

Document Summary

Usually depicted as oval, double membraned organelles, mitochondria undergo rounds of fusion and ission and their shape can change to be considered tubular. Mitochondria have 2 membranes: outer mitochondrial membrane (omm) Porins large channel proteins, when open membrane is freely permeable (ex. to. Doubled-layered folds = cristae: increase membrane surface area, contain machinery for aerobic respiraion and atp formaion. Rich in a phospholipid called cardiolipin (characterisic of bacterial membranes) Provide cells with energy (atp) obtained from glucose. Glycolysis occurs in the cytoplasm outside mitochondria. Pyruvic acid oxidation occurs enirely in mitochondrial matrix. Tricarboxylic acid (tca, aka kreb cycle) occurs mainly in matrix, ends in the imm. Oxidaions and breakdown of 1 molecule of glucose = 36 atp. Transport chain: energy transfer at each complex used to pump h+ from matrix into inter- membrane space, eventually, low energy electron transferred to terminal electron acceptor (o2) Step 2: proton movement down electrochemical gradient powers atp synthesis.