Question

9. Which of the listed enzymes of the TCA cycle is regulated by phosphorylation/dephosphorylation cycle ? : a. isocitrate dehydrogenase b. succinate dehydrogenase c. malate dehydrogenase d. a-ketoglutarate dehydrogenase complex e. citrate synthase 10. Name the enzyme catalyzing the following reaction: COOH + GTP - PEP + CO2 + GDP C=0 CH2 COOH a. PEP carboxykinase b. pyruvate kinase d. pyruvate carboxylase c. malic enzyme 11. Name the enzyme that catalyzes the reaction: glyoxylate + CH3CO-SCOA -- → malate + HSCOA a. malate synthase d. isocitratase b. succinate thiokinase c. aconitase 12. Energy depletion in the cell of bacteria or the accumulation of the intermediates of the citric acid cycle and glycolysis leads to: a. activation of isocitrate lyase b. activation of protein kinase acting on isocitrate dehydrogenase c. inactivation of the protein phosphatase acting on the isocitrate dehydrogenase d. dephosphorylation of the isocitrate dehydrogenase 13. CO2 released during the turn of TCA cycle originates from: a. the old carbons in the cycle contained in the oxaloacetate acceptor b. the new carbons arriving with the Acetyl-SCOA 14. Glycerophosphate shuttle will transfer cytoplasmic hydrogens generated during the glycolysis into mitochiondria as: a. NADH + H b. FADH2

Answer 1

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