Of the allosteric enzymes listed below, which are suppressed by NADH? Select all that apply. the pyruvate dehydrogenase complex a-ketoglutarate dehydrogenase complex isocitrate dehydrogenase pyruvate kinase phosphofructokinase hexokinase glucokinase
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- What four allosteric enzymes or enzyme complexes are responsible for the regulation of the citric acid cycle? Select all that apply. Malate dehydrogenase Fumarase Succinyl CoA synthetase Aconitase a-ketogluatarate dehydrogenase Succinate dehydrogenase Pyruvate dehydrogenase Citrate synthase Isocitrate dehydrogenaseThe enzyme, dihydrolipoamide dehydrogenase is present in both pyruvate dehydrogenase complex and α-ketoglutarate dehydrogenase complex. What type of reaction is catalyzed by these complexes? Describe the role of dihydrolipoamide dehydrogenase in these reactions.Choose all the enzymes or enzyme systems of the citric acid cycle that could be classified as oxidoreductases. (Select all that apply.) succinate dehydrogenase aconitase isocitrate dehydrogenase α-ketoglutarate dehydrogenase complex citrate synthase fumarase malate dehydrogenase
- Identify the Krebs cycle enzyme that consumes a 3-carbon substrate molecule, producing a 2- carbon product molecule (attached to acetyl-CoA), along with NADH, and one molecule of CO2. succinyl CoA synthetase a-ketoglutarate dehydrogenase pyruvate dehydrogenase isocitrate dehydrogenase malate dehydrogenaseWhich of the following catalyzes a step that does NOT produce CO2? Group of answer choices alpha-ketoglutarate dehydrogenase complex malate dehydrogenase pyruvate dehydrogenase complex isocitrate dehydrogenase Citrate synthase is regulated by... Group of answer choices Concentrations of substrate and products Fructose-2,6-Bisphosphate Covalent modification Allosteric regulation by the levels of NADDHWhich citric acid cycle enzyme utilizes a similar reaction mechanism to pyruvate dehydrogenase? O Malate dehydrogenase Isocitrate dehydrogenase O Alpha-ketoglutarate dehydrogenase Succinate dehydrogenase
- asapNADH is produced by which of the following glycolytic (Embden-Meyerhof) enzymes? succinate dehydrogenase glyceraldehyde-3-phosphate dehydrogenase isocitrate dehydrogenase alpha-ketoglutarate dehydrogenase pyruvate dehydrogenase The glycolytic enzyme glyceraldehyde-3-phosphate dehydrogenase catalyzes the conversion of: 1,3-bisphosphoglycerate into 3-phosphoglycerate (producing ATP) glyceraldehyde-3-phosphate into 1,3-bisphosphoglycerate (producing NADH) phosphoenolpyruvate into pyruvate (producing ATP) fructose-6-phosphate into fructose-1,6-bisphosphate (consuming ATP) glucose into glucose-6-phosphate (consuming ATP)Because dichloroacetate inhibits the enzyme pyruvatedehydrogenase kinase, this compound has been used,with limited results, to treat lactic acidosis. The phosphorylation of the a-subunit of the pyruvate dehydrogenasecomponent of the pyruvate dehydrogenase complex bypyruvate dehydrogenase kinase causes complete loss ofenzymatic activity. Describe the theory behind the clinicaluse of dichloroacetate.
- During Krebs cycle, the conversion of isocitrate to alpha-keto glutarate involves all of the following reactions/mechanisms except Reduction of isocitrate Reduction of NAD+ Decarboxylation of isocitrate Oxidation of isocitrateWhich precursors accumulate in patients with niacin deficiency. What effect does this deficiency have on the pyruvate dehydrogenase enzyme complexAlpha-ketoglutarate dehydrogenase exhibits feedback inhibition by