21．通過第二信使進(jìn)行調(diào)節(jié)是下列哪種物質(zhì)進(jìn)行調(diào)節(jié)的主要方式？(      )

A.糖類                                                        B.脂肪

C.脂溶性激素                                              D.水溶性激素

22．第二信使分子DAG的作用是(      )

A.激活蛋白激酶A                                       B.激活磷脂酶B

C.激活蛋白激酶C                                       D.激活蛋白激酶G

23．當(dāng)由于大面積皮膚燙傷導(dǎo)致嚴(yán)重的低滲性脫水時(shí)，臨床上一般靜脈補(bǔ)充(      )

A．0.9％生理鹽水                                       B.5％葡萄糖水

C.0.2％生理鹽水＋5％葡萄糖水                  D.0.9％生理鹽水＋5％葡萄糖水

24．下列哪種情況下容易引起代謝性酸中毒？(      )

A．糖尿病酮癥酸中毒                                 B.嚴(yán)重肺氣腫

C.肺源性心臟病                                          D.高燒時(shí)呼吸急促

25．正常人血液中的非蛋白氮（NPN）含量為(      )

A.1～2mg/dl                                                B.3～7mg/dl      

C.9～20mg/dl                                              D.20～35mg/dl

26．關(guān)于血漿蛋白質(zhì)主要生理功能敘述錯(cuò)誤的是(      )

A．維持血漿正常的膠體滲透壓                   B.凝血和抗凝血作用

C.細(xì)胞營(yíng)養(yǎng)作用                                          D.調(diào)節(jié)基因表達(dá)

27．成熟紅細(xì)胞中不能進(jìn)行的代謝途徑是(      )

A.糖酵解                                                     B.磷酸戊糖途徑

C.糖有氧氧化                                              D.2，3-二磷酸甘油酸支路

28．引起肝昏迷的主要原因是(      )

A.白蛋白合成減少                                       B.血氨增高使腦中α-酮戊二酸下降

C.血糖過低                                                 D.血氨增高使肝合成尿素增多

29．下列哪種反應(yīng)不屬于肝臟生物轉(zhuǎn)化的第一相反應(yīng)？(      )

A.結(jié)合反應(yīng)                                                 B.還原反應(yīng)

C.氧化反應(yīng)                                                 D.水解反應(yīng)

30．一碳單位的轉(zhuǎn)運(yùn)載體是(      )

A.葉酸                                                        B.四氫葉酸

C.二氫葉酸                                                 D.泛酸