考研生物化学（Biochemistry for postgraduate studies）.doc

考研生物化学（Biochemistry for postgraduate studies） First, individual choice questions 1. description of the three class structure of protein molecules, wherein the error is: A. natural protein molecules have this structure B. has a polypeptide chain with three levels of structure and is biologically active The stability of C. three stage structure is mainly secondary bond maintenance D. hydrophilic groups are clustered on the surface of the three structure biooo E. decided to coiled folding is amino acid residues 2. the connection between nucleotides in nucleic acids is: A.2 , 3 - phosphate two ester bond B. glycosidic linkage C.2 , 5 - phosphate two ester bond D. peptide E.3 , 5 - phosphate two ester bond 3. which statement is incorrect about the center of the enzyme activity? A. enzyme contacts with substrates are limited to smaller regions of enzyme molecules that are closely related to enzyme activity B. necessary groups can be located in the active center or outside the active center C. generally, the residues of several amino acids adjacent to the primary structure of the polypeptide chain are relatively concentrated, forming the active center of the enzyme Activation of the D. zymogen is actually the process of the formation of a complete active center E. when the substrate molecule contacts with the enzyme molecule, it can cause the conformation change of the enzyme active center 4. as the glucose carrier in glycogen synthesis: A.ADP B.GDP C.CDP D.TDP E.UDP When the plasma lipoproteins were separated by 5. electrophoresis, they were arranged sequentially from positive to negative: A.CM, VLDL, LDL, HDL B.VLDL, LDL, HDL, CM C.LDL, HDL, VLDL, CM D.HDL, VLDL, LDL, CM E.HDL, LDL, VLDL, CM 6. the order in which the electrons are delivered by various pigments in the respiratory chain: A.a, A3, B, C1, C, 1/2O2 B.b, a, A3, C1, C, 1/2O2 C.c1, C, B, a, A3, 1/2O2 D.c, C1, aa3, B, 1/2O2 E.b, C1, C, aa3, 1/2O2 7.GPT (ALT) is the most active tissue: A. myocardium B. brain C. sk