英语周报2022-2022学年高二课标Book6unit1第15期答案

书面表达One possible version:NOTICEA sports meeting will be held in the playground of our school from next Thursday to FridayAs you know, the pressure of study is very heavy now, especially for those senior 3. So the purpose of the sports meeting is to letevery student get relaxed, as a result of which we students can live happily and heal thilyEveryone is welcome to take part in it. Those who perform excellently at the sports meeting will get prizes. But don' t take theresults so serously because taking part is more important than the result. Good luck to everyone!

29.(7分,每空1分)(1)生长基因的选择性表达(2)由基因所决定的细胞自动结束生命的过程细胞凋亡在维持生物体内部环境的稳定、抵御外界各种因素的干扰方面都起着非常关键的作用(3)心肌细胞的存活率(或心肌细胞的凋亡率)甲组和丙组心肌细胞的存活率均高于乙组的存活率(或甲组和丙组心肌细胞的凋亡率均低于乙组的凋亡率)丁组加入培养液+心肌细胞+生物制剂Q【解析】(1)由图可知,①过程表示的是细胞生长;③过程表示的是细胞分化,其实质是基因的选择性表达。(2)细胞凋亡是指由基因所决定的细胞自动结束生命的过程;根据题意分析,红细胞和白细胞的功能不同,凋亡的速率也不同,后者的凋亡速率比前者要快得多,该实例体现出细胞凋亡在维持生物体内部环境的稳定、抵御外界各种因素的干扰方面都起着非常关键的作用。

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