2022智慧上进七上语文试卷答案

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bered on the tr参考范文：Social Practice in the Red-Star CommunityIn order to arouse students'awareness of social service,socialpractice in the Red-Star community was conducted by our school lastweekend.As was scheduled,we students gathered at our school's gateand set off at 7:00.Upon arrival there,we were classified into threegroups.Some students in the first group were in charge of collectingthe scattered garbage on the paths and put them into the differenttrashcans according to garbage classification.In the meanwhile,therewere other students cleaning and wiping the notice board with care,using various cleaners.Besides,the rest of students offered timely as-sistance to those in need,such as taking heavy boxes for the old.Although all the work made us exhausted and backbreaking,byparticipating in this social practice we benefitted a lot,temporarilyrefreshing ourselves from the busy study task as well as strengtheningthe bond between us and society.

22.【答案】（除标明外，每空2分）(1)从基因文库中获取、化学法人工合成（答出1点即可）DNA双链复制(2)铁结合蛋白基因、终止子驱动目的基因的转录BamH I和HindⅢ(3)确保铁结合蛋白基因插入到水稻细胞的染色体DNA上(4)植物组织培养植物细胞的全能性(1分)【关键能力】理解能力、综合运用能力心猜有所依本题涉及利用生物工程技术培育铁含量较高的转基因水稻的过程，渗透生物知识对生产的指导意义，是理论联系实际的体现，符合高考命题对学科素养的要求。【解题思路】(1)获取目的基因常用的方法有从基因文库中获取、化学法人工合成、利用PCR技术扩增。利用PCR技术扩增目的基因的原理是DNA双链复制。(2)图中基因表达载体包括铁结合蛋白基因、潮霉素抗性基因、复制原点以及启动子、终止子等，其中启动子是NA聚合酶识别和结合的部位，能驱动目的基因的转录。分析题图，铁结合蛋白基因中含有EcoR I的酶切位点，因此选用BamH I和HindⅢ两种限制酶分别处理Ti质粒和铁结合蛋白基因。(3)将目的基因插入到水稻细胞的染色体DNA上是目的基因能在水稻细胞中稳定遗传的关键。(4)图中③④⑤过程分别为脱分化、再分化、发育成植株，属于植物组织培养技术，该技术的基本原理（理论基础）是植物细胞的全能性。质羚八，效安)4