湖南省衡阳县第四中学2019届高三生物11月月考(期中)试题(扫描版).doc

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1、1湖南省衡阳县第四中学 2019届高三生物 11月月考(期中)试题(扫描版)2345671-5 DCBDC 6-10DCAAB 11-15DCCDD 16-20BBCAB 21-25BDBCA26. (10分)(1)核糖体(1 分)转运 RNA(或 tRNA) (1 分)翻译(1 分)(2) (4 种游离的)核糖核苷酸(1 分)DNA 复制(1 分)(3)起始密码子(1 分)一 AGACTT(1 分)(4)长(1 分)密码子的简并性(或多个密码子可以编码同一种氨基酸) (2 分)27. (10分)(1)0(1 分)4(1 分) (一条染色体上的)姐妹染色单体(1 分)(2)1 和 2(1 分)

2、2(1 分)卵细胞和极体(2 分)(3)EF(1 分)着丝点分裂,染色体数目加倍(2 分)28(15 分) (1)相对(1 分) 显(1 分) Aa、aa(2 分)(2) 两(1 分) AA(2 分) 1/4 (2 分)(3)两个 A基因抑制胸部长出刚毛,具有一个 A基因时无此效应 (2 分)(4)核苷酸数量减少/缺失(2 分) (5)新的突变基因经过个体繁殖后传递到下一代中不可能出现比例高达 25%的该基因纯合子(2 分)29.(15分) (1)嫩叶组织细胞易破碎(2 分) 防止 RNA降解(2 分)(2)在逆转录酶的作用下,以 mRNA为模板按照碱基互补配对的原则可以合成 cDNA(3 分)(3)目的基因无复制原点;目的基因无表达所需的启动子(4 分)(4)磷酸二酯键(2 分)(5)目的基因的转录或翻译异常(2 分)

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