16.密碼子UAC能與下列哪個(gè)反密碼子配對(duì)結(jié)合？(     )

A.AUG                                                           B.AUI

C.IUA                                                            D.IAU

17.下列有關(guān)乳糖操縱子調(diào)控系統(tǒng)的論述，哪一項(xiàng)是錯(cuò)誤的？(     )

A.乳糖操縱子是第一個(gè)發(fā)現(xiàn)的操縱子

B.乳糖操縱子由三個(gè)結(jié)構(gòu)基因及其上游的啟動(dòng)子和操縱基因組成

C.乳糖操縱子的調(diào)控因子有阻遏蛋白、cAMP和誘導(dǎo)物等

D.乳糖操縱子調(diào)控系統(tǒng)的誘導(dǎo)物是葡萄糖

18.胰島素是從哪種腺體中提取的？(     )

A.胸腺                                                           B.胰臟

C.肝臟                                                           D.腎上腺

19.生物體內(nèi)的羧化反應(yīng)需要_____作為輔酶。(     )考試用書

A.葉酸                                                           B.維生素C

C.生物素                                                       D.維生素B₆

20.在信息傳遞過程中，細(xì)胞內(nèi)產(chǎn)生的信息分子稱為(     )

A.效應(yīng)酶                                                       B.胞內(nèi)受體

C.第一信使                                                    D.第二信使