英语周报2022-2022高考第10期答案

1.(12分,除标注外,每空1分)(1)N、P乙(2)Ⅱ、Ⅲ、Ⅳ(3)甲基绿、吡罗红混合染色剂质量分数〔的盐v酸(2分)增大结构1的通透性,加速染色剂进公细胞(2分)使结构2的DNA和蛋白质分离,有利于DNA与染色剂结合(2分)(4)染色均匀,色泽浅视野中央【解析】(1)在图甲中,Y(脱氧核苷酸)与Z(核糖核苷酸)都是由C、H、O、N、P组成。在图乙中,结构1表示的细胞膜主要由磷脂和蛋白质组成,结构2表示的染色体主要由DNA和蛋白质组成,可见,甲为磷脂,乙是蛋白质,丙为DNA;磷脂和DNA都是由C、H、O、N、P组成,两图中A代表的元索是N、P。(2)不同生物的遗传物质(DNA)具有物种的特异性,以DNA的一条链为模板通过转录合成的RNA以及DNA指导合成的蛋白质也都具有物种的特异性,即具有物种特异性的是Ⅱ、Ⅲ、Ⅳ。(3)甲基绿使DNA呈现绿色,吡罗红使RNA呈现红色,因此鉴别细胞中Ⅱ(DNA)、Ⅲ(RNA)的分布,使用的试剂是甲基绿、吡罗红混合染色剂。本实验用质量分数8%的盐酸水解细胞,其作用:增大结构1(细胞膜)的通透性,加速染色剂进人细胞,同时使结构2(染色质)中的DNA与蛋白质分离,有利于DNA与染色剂结合。(4)利用显微镜观察细胞中DNA和RNA分布,应选择染色均匀、色泽浅的区域并移至视野中央。

Dear Mike,Hows it going recently! Ive heard that you'l studywith me for some time in the future as an exchange studentIt'l be my pleasure to tell you something aboutour teachersTo be frankIn our school, my tavonte teacher Is ourChinese teacher, Ms. Liu. She is in her thirties and looksEmuch younger for her age. She is tall and slim with longhair reaching her waist. She is not only strict with us, butaho kind and optimistic about life, which makes her sopopular among us. She always encourages us to overcomethe difficulties in our life More importantly, her way ofteaching that makes Chinese so easy and interesting for usto learn, is nothing like that of the other teachers'. It isconfirmed that under the guidance of such a talentedteacher, we will achieve what we want and be more confident in our future lifeI'm looking forward to your arrival and welcome to ourchoBest wishes and stay healthy.Yours,Ua

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