(will give first correct answer ) which option correctly describes glucose catabolism? 1. glucose is broken down in glycolysis, yielding two atp molecules; after the krebs cycle, 34 molecules of atp are formed in ets reactions. 2. glucose is broken down in glycolysis, yielding pyruvic acid; after the krebs cycle, two molecules of atp are formed in ets reactions. 3. glucose is broken down in glycolysis, yielding two atp; after the krebs cycle, nadh and fadh2 are formed, yielding nad+ and fad in ets reactions. 4. glucose is broken down in glycolysis, yielding pyruvic acid; after the krebs cycle, nadh and fadh2 are formed, yielding 34 adp in ets reactions.