问题 单项选择题

下列哪项是G2/M检测点的核心()

A.CyclinD

B.CDK2

C.CyclinBl

D.cdc2

E.CDK4

答案

参考答案:D

解析:时相次序检测点可以确保细胞周期时相的严格次序和不重复性。G2/M检测点的核心是cdc2,激活后的cdc2磷酸化是在M期起关键作用的底物蛋白,使细胞进入M期。CyclinBl在G2/M转换点与cdc2形成CyclinBl/cdc2复合物,活化cdc2即有丝分裂促进因子MPF。

完形填空
A doctor entered the hospital in a hurry after being called in for an urgent       .He answered the call as soon as possible, changed his clothes and went directly to the operation block.He found the boy's father       in the hall waiting for the doctor. On seeing him, the dad        , "Why did you take all this       to come? Don't you know that my son s life is in danger? Don't you have any sense of      ?"
The doctor smiled and said, "I am sorry, I wasn't in the hospital and I        as fast as I could after receiving the call...And now, I wish you'd calm down work."      I can do my work.”
“Calm down? What if your son is in this room right now, would you calm down? If your own son is      now what will you do?” said the father       .
The doctor smiled again and replied," I will say what Job said in the Bible 'From dust we came and to dust we return, blessed by the name of God'.     cannot extend lives. Go and       for your son.we will do our best by God's grace."
"Giving advice when we re not       is so easy." murmured the father.The operation took some hours       which the doctor went out happily.
"Thank goodness!  Your son is saved ! " And without waiting for the father's reply he carried on his       running. “If you have any question, ask the nurse!"
"Why is he so       ? He couldn't wait some minutes so that I could ask about my son's       ?" commented the father when seeing the nurse minutes after the doctor left. The nurse answered,        coming down her face, "His son died yesterday in a road accident.He was in the funeral when we called him for your son's operation.      now that he saved your son's life, he left running to finish his son's funeral."
Never     anyone...because you never know how their life is and what they're      .
小题1:
A.meetingB.careerC.operationD.travel
小题2:
A.callingB.runningC.jumpingD.pacing
小题3:
A.admittedB.expressedC.whisperedD.shouted
小题4:
A.timeB.costC.loveD.turn
小题5:
A.humorB.responsibilityC.prideD.honor
小题6:
A.workedB.leftC.cameD.moved
小题7:
A.in caseB.so thatC.untilD.even if
小题8:
A.dyingB.lyingC.missingD.dropping
小题9:
A.sadlyB.cheerfullyC.hopefullyD.angrily
小题10:
A.GodB.TeachersC.FriendsD.Doctors
小题11:
A.speakB.spellC.prayD.think
小题12:
A.worriedB.concernedC.lostD.tired
小题13:
A.afterB.forC.beforeD.with
小题14:
A.wayB.spiritC.trustD.dream
小题15:
A.patientB.proudC.powerfulD.absent
小题16:
A.positionB.medicineC.stateD.life
小题17:
A.sweatsB.coldC.cloudsD.tears
小题18:
A.AndB.ButC.OrD.While
小题19:
A.ignoreB.judgeC.explainD.believe
小题20:
A.doingB.loadingC.experiencingD.reducing
单项选择题