26.在正常機(jī)體內(nèi)，兩種主要轉(zhuǎn)氨酶(AST和ALT)在何種部位中活性最低?

A.心臟                                                             B.肝臟

C.腎臟                                                             D.胰腺

E.血液

27.下列化合物中不屬于核苷酸的是

A.NAD⁺                                                           B.NADP⁺

C.FAD                                                             D.TPP

E.ATP

28.下列化合物中屬于體內(nèi)嘧啶核苷酸補(bǔ)救合成原料的是

A.一碳單位                                                      B.天冬氨酸

C.谷氨酰胺                                                      D.CO₂

E.尿嘧啶

29.下列酶和蛋白因子中參與DNA復(fù)制的是

A.RNA聚合酶                                                  B.DNA聚合酶

C.sigma因子                                                    D.Rho因子

E.RF因子

30.一個(gè)基因中可轉(zhuǎn)錄生成RNA的DNA鏈?zhǔn)?/P>

A.親代DNA                                                     B.模板鏈

C.編碼鏈                                                         D.領(lǐng)頭鏈

E.隨從鏈

31.蛋白質(zhì)翻譯延長(zhǎng)所需要的酶或因子是

A.解鏈酶                                                         B.EF

C.IF                                                                 D.Rho因子

E.sigma因子

32.tRNA運(yùn)載氨基酸時(shí)連接氨基酸的鍵是

A.鹽鍵                                                             B.氫鍵

C.肽鍵                                                             D.酯鍵

E.磷酸二酯鍵

33.下列不屬于酶別構(gòu)調(diào)節(jié)特點(diǎn)的是

A.含多個(gè)亞基聚合                                           B.有催化和調(diào)節(jié)亞基

C.代謝物常為別構(gòu)劑                                        D.別構(gòu)劑與酶共價(jià)結(jié)合

E.活性改變時(shí)伴有構(gòu)象變化

34.下列酶中可受茶堿抑制，使cAMP半衰期延長(zhǎng)的是

A.腺甘酸環(huán)化酶                                               B.鳥苷酸環(huán)化酶

C.磷酸二酯酶                                                  D.蛋白激酶A

E.蛋白激酶G

35.細(xì)胞外液的主要陽離子和陰離子分別是

A.K⁺和Mg²⁺；Cl^-和HC0₃^-。                              B.Na⁺和K⁺；Cl^-和HCO₃^-

C.K⁺和Mg²⁺；有機(jī)和無機(jī)磷酸                         D.Na⁺和K⁺；有機(jī)和無機(jī)磷酸

E.Na⁺和Me²⁺；有機(jī)酸和蛋白質(zhì)