生化自测题（Biochemical self-test）.docVIP

生化自测题（Biochemical self-test） I. choose a question (1 points per subject, 40 points each), choose the best answer for each question, and fill in the brackets before the answer 1. which amino acids are acidic amino acids below: () A. glycine, B. phenylalanine, C. cysteine, D. glutamic acid 2., the factors that maintain the stability of protein colloids are: () The B. charge of A. hydration membrane is C.A+B and D. is independent of A and B 3. which of the following statements is incorrect in the description of protein denaturation: () Destruction of conformation in A. space; destruction of B. primary structure C. loss of biological activity, decrease in hydration of D., decrease in solubility 4. which of the following is not true about the description of isozymes: () A. sources can be different, B. physical and chemical properties of the same D. catalyze the same reaction and C. molecular weight can be different 5. which of the following matches the competitive inhibition of enzymes: () The A. inhibitors are similar in structure to the active center of the enzyme The inhibition of B. was independent of the concentration of inhibitor C. inhibition was unaffected by substrate concentration The D. inhibitors are similar in structure to the substrate of the enzyme action 6. the correct description of the holoenzyme is: () A. a coenzyme that binds to a variety of enzyme proteins to form a holoenzyme with different catalytic activities B. all enzymes have four levels of structure C. coenzyme or cofactor determines the specificity of enzymatic reaction D. enzyme protein has catalytic activity in itself 7. vitamins involved in a single carbon unit are: () A. folic acid, B., biotin, C., vitamin B6, D., vitamin C 8. lack, can cause beriberi vitamin is: (a) A.VtB1 B.VtB2 C.VtC D.VtPP The physiological significance of the 9. pentose phosphate pathway is: () A. provides NADH+H+ B. to provide NADPH+H+ C. provides 6- phosphate D., which provides the raw material for gluconeogenesis