The Overall Pathway of Glycolysis

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In all these reactions, the conversion of glucose to product is an oxidation reaction, requiring an accompanying reduction reaction in which NAD is converted to NADH, a point to which we shall return when we discuss the pathway in detail. The breakdown of glucose to pyruvate can be summarized as follows  

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2 Conversion of Six-Carbon Glucose to Three-Carbon Glyceraldehyde-3-Phosphate 

Glucose (Six carbon atoms) 2 Pyruvate (Three carbon atoms) 

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