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。
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
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 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.
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