安徽省芜湖市2019-2020学年高二上学期期中考试生物试卷
※题型：单选题※知识点：单选题※试题难度：较易<br>下列关于遗传物质探索历程的叙述,错误的是( )<br>A.若<sup>32</sup>P标记组的上清液有放射性,则可能原因是搅拌不充分<br>B.将S型菌的DNA、蛋白质、多糖等物质与R型活菌混合培养,培养基中均有R型菌出现<br>C.噬菌体侵染细菌实验的成功,是因为采用同位素标记法将蛋白质与DNA分开研究<br>D.噬菌体侵染细菌实验比肺炎双球菌体外转化实验更具说服力<br>答案<br><img src="https://picture2.zhihuicn.com/answer/1/9/2015/b44ecb21551345208116cb6f8f885201/C6DD893B0461FAD877175A7ECBBD5939.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/1/9/2015/2a9fa48fbe7246ed95254485e0dd7d96/85D508376F8A2EED21488EA9904E41F2.png"><br><br>※题型：单选题※知识点：单选题※试题难度：较易<br>下列能正确表示DNA片段示意图的是( )<br>A.<img src="https://picture2.zhihuicn.com/testImage/1/2010/11/22/353E29F9920F1B3F128FCB8ADB73311A.png"><br>B.<img src="https://picture2.zhihuicn.com/testImage/1/2010/11/22/55286606147056B49C2AC1C0D9D71985.png"><br>C.<img src="https://picture2.zhihuicn.com/testImage/1/2010/11/22/76DB7D3612E3EC9CBA9AF2D472BA7F64.png"><br>D.<img src="https://picture2.zhihuicn.com/testImage/1/2010/11/22/4130BC7BC85B4539516A02C2547429DE.png"><br><br>答案<br><img src="https://picture2.zhihuicn.com/answer/1/9/2010/5767415658fa47a8b596dba0a023f818/2BB966A0E0D0EF1A330D14E3ADEDA5C5.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/1/9/2010/8954f0e6d0cb45ab848cab33df07ea5f/A6B99B0111B90A0744694265AA4C7E41.png"><br><br>※题型：单选题※知识点：单选题※试题难度：较易<br>在一个DNA分子中,腺嘌呤与胸腺嘧啶之和占全部碱基总数的42%。若其中一条链的胞嘧啶占该链碱基总数的24%、胸腺嘧啶占30%,则另一条链上,胞嘧啶、胸腺嘧啶分别占该链碱基总数的( )<br>A.34%、12% B.21%、12% <br>C.30%、24% D.58%、30%<br>答案<br><img src="https://picture2.zhihuicn.com/answer/1/9/2011/b2c29907a5124584a2eb4e5f9396f894/C6DD893B0461FAD877175A7ECBBD5939.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/1/9/2011/7f61977cc53f405689340d0c72011409/6DA81066189D80982DC32FB6BBA4F983.png"><br><br>※题型：单选题※知识点：单选题※试题难度：中等<br>某一个DNA分子的碱基总数中,腺嘌呤为200个,复制数次后,消耗周围环境中含腺嘌呤的脱氧核苷酸3000个,则该DNA分子已经复制了几次(是第几代)( )<br>A.3次(第4代) B.4次(第5代) C.5次(第6代) D.6次(第7代)<br>答案<br><img src="https://picture2.zhihuicn.com/answer/1/9/2020/3429884ad3ab46d4a7f54bc31387b8d3/CB10E80A5A739A58F1312BA12F379467.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/1/9/2020/ff46ba86a1314e72a96cbd467192a3a2/E7CCAC45FD6D5C599B9719AC1F8BE22F.png"><br><br>
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