问题 单项选择题

T2噬菌体在大肠杆菌细胞中增殖时,不需要下列哪种酶参与()

A.ATP水解酶

B.DNA聚合酶

C.逆转录酶

D.解旋酶

答案

参考答案:C

解析:T2噬菌体在大肠杆菌细胞中增殖时,形成DNA需要旋酶用于解旋;DNA聚合酶用于合成DNA的子链;ATP水解酶用于水解ATP,为各项活动提供所需能量;逆转录酶发生在HIV或者肿瘤病毒的繁殖过程中。

完形填空
完形填空
Miracles(奇迹)will happen if you don't give up trying. Even if you have  1 for one hundred times, you may succeed when you try for the 10lst time.
When I was born, my doctor told my mother that there was something wrong with my 2  . They were too soft to be able to walk. Although the news was bad, my mother didn't become  3  . She didn't believe what the doctor said  4  started to look for other ways.
My mother kept looking for other doctors for me, and finally she  5  . The doctor and his team in the hospital did   6  they could to help me. They also asked my parents to teach me to do some  7  to help me walk. One day when my mother came to pick me  8  . I crawled towards her. She was so surprised and happy that she couldn't believe  9   eyes. Crawling was not walking, but it was a good 10  . Day by day, I could walk by myself.
When I grew up, my mother   11  told me these stories. She said that if I thought of what she said whenever I met  12 , I could do anything successfully. I have been working hard and I have turned out to be a very   13   person. I get best  14  in school and I am a good dancer and swimmer. 15   my mother's strong resolution, I live a happy life now. What the story tells us, as my mother always says, is: Never give up.
小题1:
A.achievedB.failedC.suggestedD.told
小题2:
A.legsB.handsC.armsD.eyes
小题3:
A.patientB.confidentC.frustratedD.proud
小题4:
A.orB.andC.ifD.because
小题5:
A.forgotB.changedC.succeededD.worked
小题6:
A.nothingB.somewhereC.anywhereD.everything
小题7:
A.timeB.exerciseC.medicineD.shopping
小题8:
A.awayB.fromC.intoD.up
小题9:
A.herB.myC.hisD.its
小题10:
A.adviceB.endC.chanceD.start
小题11:
A.hardlyB.neverC.alwaysD.nearly
小题12:
A.dreamsB.experimentsC.jobsD.difficulties
小题13:
A.excellentB.dangerousC.busyD.special
小题14:
A.presentsB.friendsC.booksD.grades
小题15:
A.Such asB.Instead ofC.Because ofD.Together with
名词解释