2012年高考生物试卷(四川)(解析卷)
可能用到的相对原子质量:H1C12O16S32一选择题(本大题共13小题,每小题6分。在每小题给出的四个选项中,只有一项是符合要求的)1.蛙的受精卵发育成原肠胚的过程中,下列行为在细胞内不能发生的是A.基因的选择性表达B.DNA的半保留复制C.同源染色体的分离D.姐妹染色单体的分开2.将大肠杆菌的质粒连接上人生长激素的基因后,重新置入大肠杆菌的细胞内,通过发酵就能大量生产人生长激素。下列叙述正确的是A.发酵产生的生长激素属于大肠杆菌的初级代谢产物B.大肠杆菌获得的能产生人生长激素的变异可以遗传C.大肠杆菌质粒标记基因中腺嘌呤与尿嘧啶含量相等D.生长激素基因在转录时需要解旋酶和DNA连接酶[来源...
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