1 what is the common intermediary in the catabolism of carbohydrates, proteins and lipids? 2 What cyclic pathway doe sthis common metabolite enter? 3 what are the roles of NAD+ and FAD in metabolism  4 what are the reduced forms of NAD+ and FAD? 5 what are the entry point for the reduced forms of NAD+ and FAD in the electron transport chain?

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