13. During strenuous exercise, the NADH formed in the glyceraldehyde 3-phosphate dehydrogenase reaction in skeletal muscle must be reoxidized to NAD+ if glycolysis is to continue. The most important reaction involved in the reoxidation of NADH is:

(A)dihydroxyacetone phosphate → glycerol 3-phosphate.

(B)glucose 6-phosphate fructose 6-phosphate.

(C)isocitrate → a-ketoglutarate.

(D)oxaloacetate malate.

(E) pyruvate lactate.

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