11．下面哪種化合物不含有高能磷酸鍵？(      )

A.葡萄糖-6-磷酸                                         B.ADP

C.磷酸烯醇式丙酮酸                                   D.ATP

12．尿素合成的主要器官是(      )

A.腎臟                                                        B.肝臟

C.胰臟                                                        D.脾臟

13．γ-氨基丁酸是下列哪個(gè)氨基酸經(jīng)脫羧而產(chǎn)生的？(      )

A.色氨酸                                                     B.賴氨酸   

C.谷氨酸                                                     D.鳥氨酸

14．正常人血液中的血氨濃度不超過(      )

A.0.01mg/L                                                 B.0.1mg/L  

C.1mg/L                                                      D.10mg/L

15．通過以DNA為模板合成RNA的過程，稱為(      )

A.逆轉(zhuǎn)錄                                                     B.轉(zhuǎn)錄

C.RNA復(fù)制                                                D.反向轉(zhuǎn)錄

16．遺傳密碼AUG，既是起始密碼，又是下面哪種氨基酸的密碼？(      )

A.蛋氨酸                                                     B.色氨酸   

C.酪氨酸                                                     D.甘氨酸

17．在蛋白質(zhì)生物合成過程中，作為氨基酸運(yùn)載工具的是(      )

A.mRNA                                                     B.cRNA     

C.rRNA                                                       D.tRNA

18．mRNA上遺傳密碼子5’-AGU-3’能與下列哪個(gè)反密碼子配對(duì)結(jié)合？(      )

A.5’-UCA-3’                                                B.3’-ACU-5’      

C.5’-ACU-3’                                                D.3’-TCA-5’

19．關(guān)于鏈霉素影響細(xì)菌蛋白質(zhì)生物合成的敘述，正確的是(      )

A．能抑制蛋白質(zhì)的翻譯過程                      B.能抑制DNA的復(fù)制過程

C.能抑制DNA聚合酶活性                          D.能抑制RNA聚合酶活性

20．體內(nèi)物質(zhì)的代謝有幾個(gè)不同的調(diào)節(jié)層次？(      )

A.1                                                             B.2     

C.3                                                             D.4