所屬科目:研究所、轉學考(插大)◆生物化學
3.Which of the following descriptions about Hb (hemoglobin) is incorrect? (A) One Hb can bind 1 O2 molecules (B) HbA has an a2β2struc cture (C) HbF has an a2γ2 structure (D) HbF has a lower affinity for BPG than does HbA (E) CO2decreases the binding affinity of Hb for O2.
4.Which of the following descriptions about the Michaelis-Menten rate equation is incorrect? (A) KM measures the substrate concentration at which the reaction rate is (B) is the turnover er number that measures the rate of the catalytic process (C) The ratio is a convenient measure of enzyme efficiency (D) KM is the Michaelis constant (E) A competitive inhibitor increases the apparent KM.
9.Which of the following descriptions regarding disaccharide is incorrect? (A) Sucrose is a-D-glucopyranosyl (1→2) β-D-fructofuranoside (B) Sucrose is a non-reducing sugar (C) Maltose has an a(1→4) linkage (D) Cellobiose is β-D-glucopyranosyl (1→4) β-D-glucopyranose (E) Lactose is a non-reducing sugar.
16. loops are found in (A) mRNA (B) rRNA (C) tRNA (D) hnRNA (E) snRNA.
22.Which of the following tautomeric forms is the major form of glucose in solution? (A) a-pyranose (B)β-pyranose (C) a-furanose (D) β-furanose (E) all of the above.
28. Which of the following reactions is not located in mitochondria? (A) gluconeogenesis (B) tricarboxylic acid cycle (C) electron transport (D) β-oxidation (E) oxidative phosphorylation.
29.In a Lineweaver-Burk double reciprocal plot, the intercept of the y-axis equals_____. (A) KM (B) -1/KM (C) (D) 1/ (E)
39. Lactase (β-galactosidase) contains a structure of_______. (A) monomer (B) dimer (C) trimer (D) tetramer (E) none of the above.
40. Ribose exists in RNA as the stru ure of_______. (A) a-pyranose (B)β-pyranose (C) a-furanose (D) β-furanose (E) all of the above.