英语周报九年级上册2019至2022答案

4(爸幂D唐什么命题人考查基因转录过程的相关知识。这么考图甲中的RNA可以与转录的模板链完全配对,而乙图中的RNA与模板链配对时,模板链上的一些序列还处于游离状态,所以甲图中的RNA是hRNA,乙图中的RNA是成熟的mRNA。图甲中hnRNA转录过程碱基互补配对方式是A-UT-A、C-G、G-C,A项错误;形成成熟的mRNA过程不需要DNA连接酶参与,B项错误;RNA链和DNA链中的碱基种类有所区别,所以图甲中的 hnRNA与转录模板链的互补链碱基序列不同,C项错误;由于成熟的mRNA通过加工形成其中碱基的数日就与转录的模板链不同,所以以成熟的mRNA为模板通过逆转录合成的脱氧核苷酸链中的碱基序列与基因中的转录模板链的碱基序列不同,D项正确。

书面表达One possible versionDear johnI'm glad to tell you that my family will visit London during this summer holiday, when we can get togetherwith you there. Taking advantage of this opportunity, I'd appreciate it if you can tell me much about British history, such as the formation of the UK and its cultural tradition as well as its local customsAs I am not familiar with London, please recommend some tourist attractions for me. Ive heard that Lon-don has a lot of attractions, especially famous ancient architecture. If it is convenient for you, please be ourguide, giving a detailed description of the scenic spots at any timeLooking forward to your replyYoursLi hua

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