Glycolysis
Glycolysis is the first step in Cellular respiration. When glucose enters the cytoplasm it is broken down into 2 pyruvic acids, this process is glycolysis. When the glucose compound enters the cytoplasm ATP is used to break it down into two 3-Carbon molecules. The 3-C molecules then give electrons and hydrogen ions to NAD+ which makes NADH. Then a pyruvate attaches to each of the 3-C molecules. ADP latches on to the phosphate groups creating a net of two ATP and two pyruvic acid, which enters the mitochondria and the Krebs cycle.
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At the end of glycolysis if no Oxygen is present then The pyruvates go through fermentation. In both forms of fermentation NADH drops of a Hydrogen ion and two electrons, but in ethanol fermentation CO2 is formed as a by product crating ethanol.