问题
问答题
S1核酸酶作图(S1-mapping)
答案
参考答案：利用DNA与mRNA的杂交来研究内含子及转录的起点和终点。方法是DNA与mRNA进行同源杂交后，用S1核酸酶除去非配对的DNA，杂交片段被保护。由S1酶图谱可分析DNA转录情况。
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S1核酸酶作图(S1-mapping)
参考答案：利用DNA与mRNA的杂交来研究内含子及转录的起点和终点。方法是DNA与mRNA进行同源杂交后，用S1核酸酶除去非配对的DNA，杂交片段被保护。由S1酶图谱可分析DNA转录情况。
This is a girl. She’s 31 English girl. Her name’s Becky. She’s twelve. She lives in Beijing. She’s in 32 . She studies 33 in it. Mr Liu is her Chinese teacher. 34 name is Liu Yong. He’s a good teacher. He teaches Chinese very well. His 35 number is 6526─8559.He loves his students very 36 . Becky’s father and mother 37 teachers. Her father is Mr Green. 38 works in Beijing now. He 39 us English. He 40 to work by bike. He’s our good friend.
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