exam_3a - Biol 638, Exam-3 (Code-1) Biology 638...

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Biol 638, Exam-3 (Code-1) Biology 638 – Biochemistry II Exam-3 Code-1 March 12, 2010 (Note that you are not allowed to use any calculator) 1 . Select the statement that is not correct. a. Pyruvate carboxylase has a covalently connected biotin in the active site. b. Pyruvate carboxylase is inhibited by alanine. c. In the pyruvate carboxylase reaction, HCO 3 - is phosphorylated by ATP and the phosphorylated HCO 3 - reacts with the bound cofactor. d. If gluconeogenesis is started at pyruvate, the next compound is oxaloacetate. e. None of the above 2 . Select the statement that is not correct. a. If isocitrate lyase and malate synthase are present in mitochondrion of animal liver cells, animal can synthesize glucose from either amino acids or fatty acids. b. If liver PFK-2/FBPase-2 is replaced with the heart muscle isozyme, glucogeogenesis would not be occurred. c. Acetyl-CoA is a powerful allosteric activator of pyruvate carboxylase. d. Fuctose-1,6-bisphosphatase and Glucose-6-phosphatase are only present in liver cells. e. None of the above. 3 . Select the statement is not correct. a. Oligosaccharides are constructed on dolichol in the lumen of rough ER. b. The oligosaccharides on Asn are attached during the protein synthesis. c. In a posttranslational modification in Golgi apparatus, oligosaccharides are constructed on Ser or Thr residues of proteins. d. There are three distinct linkages between protein and origosaccharides. e. None of the above 4 . Select the statement that is not correct. a. Transketolase has a TPP coenzyme and carries a C 2 -unit. b. Transaldolase has a neutral Lys and carries a C 3 -unit. c. Pentose phosphate pathway is controlled by the rate of the 6-phosphogluconate dehydrogenease reaction. d. Ru5P to R5P conversion in pentose phosphate pathway is catalyzed by an isomerase. e. None of the above. 5 . Select the statement that is not correct. a. Light reaction and dark reaction of plant photosynthesis occur in thylakoid and stroma, respectively. b. Chlorophylls cannot absorb most light between 480 nm and 620 nm wavelengths.
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exam_3a - Biol 638, Exam-3 (Code-1) Biology 638...

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