(1)EMP途径( Embden-Meyerhof pathway) igure 5.17 Fermentation Glycolysis The inset indicates the relationship of fermentation to the overall G ucose energy-producing processes. (a) An overview of fermentation, The first step is glycolysis, the con- version of glucose to pyruvic acid 2 NAD+ 2 ADP In the second step, the reduce coenzymes from glycolysis or its 2(NADH 2< ATP ternatives(NADH, NADPH) onate their electrons and hydro gen ions to pyruvic acid or a derivative to form a fermentation RESPIRATION 2 Pyruvic acid end-product.(b) End-products of Glycolysis NADH various microbial fermentations NADH In fermentation, ATP is gener- ated only during glycolysis Krebs cycle 2( NADH Pyruvic acid (or derivative) 2 NAD+ Formation of fermentation end-products transport chain and chemiosmosis(1)EMP途径（Embden-Meyerhof pathway）