2020-2021学年高一生物苏教版必修二随堂检测（7）DNA分子的结构和复制
※题型：单选题※知识点：单选题※试题难度：中等<br>下列有关DNA的结构的叙述,正确的是( )<br>A.基本组成单位是核糖核苷酸<br>B.磷酸和五碳糖排列在内侧<br>C.碱基对构成DNA的基本骨架<br>D.具有规则的双螺旋结构<br>答案<br><img src="https://picture2.zhihuicn.com/answer/1/9/2019/b0c283f48d044199b5c340648d219e9c/01A39E48B8A67989A23F6887F26FCC64.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/1/9/2019/f64587f49906493bbb155c5356acb7ef/4A48CA5AC504C575D144E3E8FA5DC29A.png"><br><br>※题型：单选题※知识点：单选题※试题难度：容易<br>下图为DNA的结构示意图。其中决定DNA多样性的结构是( )<img src="https://picture2.zhihuicn.com/testImage/1/2019/12/4/31F3FCB1743191948BF50B01A4925CDA.png"><br>A.① B.② C.③ D.④<br>答案<br><img src="https://picture2.zhihuicn.com/answer/1/9/2019/8f006ec7ec264de0a7c4a7f599e3e007/76900E09FAB5EBA344B8EA84E844FF07.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/1/9/2019/5581ef8fee2e430ab24886b735a63679/0D469F11F3DF2D2180CB52FB2B5569C5.png"><br><br>※题型：单选题※知识点：单选题※试题难度：容易<br>决定DNA遗传特异性的是( )<br>A.碱基互补配对原则<br>B.脱氧核苷酸链上磷酸和脱氧核糖的排列特点<br>C.嘌呤总数和嘧啶总数的比值<br>D.碱基对的排列顺序<br>答案<br><img src="https://picture2.zhihuicn.com/answer/1/9/2019/2f278ceb4d2f4286a799e0f5623d8d88/01A39E48B8A67989A23F6887F26FCC64.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/1/9/2019/67f05733bfed49a183f362fe820fbdd5/F58F0F4C638D0CB3A5A912C92E8C68E4.png"><br><br>※题型：单选题※知识点：单选题※试题难度：中等<br>某DNA分子中,胞嘧啶与鸟嘌呤共占碱基总数的46%,其中一条链上腺嘌呤占此链碱基总数的28%,则另一条链上腺嘌呤占此链碱基总数的比例为( )<br>A.46% B.26% C.54% D.24%<br>答案<br><img src="https://picture2.zhihuicn.com/answer/1/9/2021/8b9af6132e174a7499a6020ca96983eb/CB10E80A5A739A58F1312BA12F379467.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/1/9/2021/acddd79ab62e48eea0345c440bb08941/5FAE33150FE752EE8A81DD3A0FC14B0E.png"><br><br>※题型：单选题※知识点：单选题※试题难度：较易<br>如图为真核细胞内DNA分子复制过程的模式图。若不考虑变异,则下列叙述错误的是( )<br><img src="https://picture2.zhihuicn.com/testImage/1/2019/12/16/D1B283F4519F16BF20EF31D7B90EC06E.png"><br>A.两条母链的碱基序列完全相同<br>B.该过程需要以4种脱氧核苷酸为原料<br>C.酶①为解旋酶,酶②为DNA聚合酶<br>D.DNA分子复制的方式为半保留复制<br>答案<br><img src="https://picture2.zhihuicn.com/answer/1/9/2019/e1709c685e5143c6958be7963893114f/E7F0EDF83F40244C8F0C84B97471AED6.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/1/9/2019/56bf13ee5b3745819f19bf253c850d1f/76692CC83CD1535CCA571CF682D7403A.png"><br><br>※题型：单选题※知识点：单选题※试题难度：较易<br>某一个DNA分子的碱基中,腺嘌呤为100个,复制数次后,消耗周围环境中的腺嘌呤脱氧核苷酸1500个,则该DNA分子已经复制了( )<br>A.3次 B.4次 C.5次 D.6次<br>答案<br><img src="https://picture2.zhihuicn.com/answer/1/9/2019/2e07361647a84247a115e1822588374b/CB10E80A5A739A58F1312BA12F379467.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/1/9/2019/00906cda1b7d4f87a363013cc2e7effa/6557E842BB902196C0114722A2036830.png"><br><br>
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