High – energy compounds: chemical potentials, electrochemical potentials; Electron transport system and oxidative phosphorylation; theory of oxidative phosphosphorylation. Regulation of ATP production; Chemical thermodynamics; Oxidations and reductions. Structure, composition and functions of biological membranes; Isolation, characterization and classification of members, chemistry and biosynthesis of membranes; molecular organization of membrane components. Natural and artificial membrane bilayers – the unit membrane hypothesis; Membrane transport system – active versus passive transport systems; Transport of sugars and amino acids; lonophores.