The following paragraphs describe the first three reactions of a metabolic pathway. fill in the blanks by moving words to the appropriate blanks. note that a single red x will appear if you answer any of the blanks incorrectly. feedback will be placed next to a blank that is incorrectly filled. not all the terms will be placed. in reaction 1 of the krebs cycle, acetyl-coa formed in the pyruvate dehydrogenase reaction condenses with the four-carbon compound to form with the elimination of coenzyme a. since the product has three carboxyl groups, this pathway is referred to as the cycle. in reaction 2 of the krebs cycle, this product then undergoes to form . the enzyme is called aconitase because the compound cis-aconitate is a(n) of the reaction. reaction 3 eliminates co2 to form the 5-carbon dicarboxylic acid . oxidation also occurs, with electrons transferred from the substrate to . consequently this reaction is an oxidative decarboxylation. condensation intermediate nad+ oxaloacetate alpha -ketoglutarate citrate isomerization product fad isocitrate succinate tricarboxylic acid