Glycolysis 1. Lecture 22 Pages 427-439. With or without O2. Early Earth had no oxygen Just a form of glycolysis existed before that time. 13_01_stepwise_oxidat.jpg. ATP & Heat. Three key food types - sugars, fats, & proteins Three stage breakdown - - PowerPoint PPT Presentation
Text of Glycolysis 1
Glycolysis 1Lecture 22Pages 427-439
With or without O2Early Earth had no oxygenJust a form of glycolysis existed before that time
ATP & HeatThree key food types - sugars, fats, & proteinsThree stage breakdown -Digestion - reduces large polymers to subunits - sugars, fatty acids & glycerol, and amino acidsoutside cells - gutinside cells in lysozymesOxidative Breakdown GLYCOLYSIS - cytosol and mitrochondriaComplete oxidation - within mitrochondria
13_03_glycolysis.jpgA typical cell has about a billion ATP molecules at one time. These are used and regenerated with a minute or two!GLYCOLYSIS - No oxygen needed for this 10 step phase
Net result is the formation of just two ATP molecules & also two molecules of NADH
Without oxygen - there is really only fermentation.
Two main types -Generation of lactate - as in muscle cels running without oxygen. The lactate is excreted from the cell
The alternative, as seen here, is the formation of ethanol. Both take place in the cytosol.
13_06_NADH _ATP .jpg
With OxygenThe pyruvate generated by glycolysis is rapidly degraded to yield lots of energy and CO2Oxygen is eventually needed for the process to continueCITRIC ACID CYCLE