Theexaminationofbiochemistry..doc

The examination of biochemistry of 86K English-class and seven-degree class. (A) 2002.07 I. Direction: Each question below contains one correct answer. Choose the most suitable response to each question. (40 points) Which one is an acidic amino acid? A. asp B. ala C. his D. trp E. glu Which group has the highest OD number, when the light length is 280 nm?A. ser and thr B. glu and lys C. met and phe D. asp and ser E. trp and asp Which one is the most important bond to make the secondary structure of protein more stable? Hydrophobic bond Ionic bond Hydrogen bond Van der Waals force. Disulfide bond. When one molecule of pyruvate completely oxidized in mitochondria, what is the number of substrate level phosphorylation reaction happened? A. 1 B. 2 C. 3 D. 4 E. 5 The enzyme will lose its biological activity when heated, why? The enzyme become amino acid Damaged of primary structure Damaged of secondary structure Lose its solubility Lose activator Which reaction is irreversible in following enzyme-catalyzed reactions? Aldolase Pyruvate kinase Phosphoglycerate kinase Phosphoglycerate mutase Triose phosphate isomerase 7. Hexokinase catalyzes the first step in the glycolysis pathway. During this step, glucose is A. Phosphorylated to glucose-1-PO4 B. Phosphorylated to glucose-6-PO4 C. Hydrolyzed into three-carbon fragments D. Isomerized to fructose E. None of these 8. In general, glycolysis is inhibited by A. ATP, glucose B. NAD + , ATP C. ADP, NADH D. ATP, NADH E. None of these 9. In gluconeogenesis (glucose synthesis), phosphoenolpyruvate is formed directly from A. Acetyl-CoA B. Malate C. Oxaloacetate D. Pyruvate E. None of these 10. The key enzyme of synthesis of ketone bodies is: Acetyl CoA carboxylase Succinatyl CoA transferase HMG CoA reductase HMG CoA synthetase HMG CoA lyase 11. Fatty acids that must be obtained from the diet by humans include Oleic acid palmitoleic acid