题干

在真核细胞中,合成下列物质都需要以RNA作为模板的是(  )

A:性激素和淋巴因子

B:胰岛素和细胞骨架

C:胰蛋白酶和tRNA

D:神经递质和磷脂分子

上一题 下一题 0.0难度 选择题 更新时间:2020-01-11 07:44:39

答案(点此获取答案解析)

B

同类题1

阅读下文,回答问题

诗意山水(有删改)

    ①我一向固执地认为,是峻秀神奇的中国山水哺育了唐诗、宋词、元曲空前绝后的绚丽和辉煌,成就了王维、吴道子、米芾、张旭等震烁古今中外的丹青宗师和绘画巨匠。而中国的山水自然,又是拥裹着风花雪月,夹缠着离愁别绪,浸渍着爱恨怨忧的历史境况和人生体验,在平平仄仄的诗赋歌咏中,醉人身心;在追求形意神韵的丹青绘画中,张扬魅力。

    ②我对涉及山水的诗文和绘画特别偏爱。总喜欢“细雨骑驴入剑门”的那种情调和意境。驾一叶扁舟,荡桨西湖,赏湖光山色,夏荷秋桂,听羌管弄晴,菱歌泛夜,扑面都是宋唐的遗风余韵;泊舟枫桥,在疏疏的江枫和寥落的渔火中,静候残月下的寒山寺钟声,于千年后再度敲乱一个游子的愁怀;竹杖芒鞋,踏上秀甲天下的峨嵋,看看曾经照亮诗仙宽大青衫的那半轮秋月,今霄是否依旧还斜挂在婆娑的树梢;穿越漫漫黄沙,在大漠深处如柱的炊烟和长河尽头浑圆的落日里,倾听那些醉卧沙场长眠不醒的远古将士们的鼾声……南国山水的,北疆山水的,西域山水的,巴蜀山水的峻美与清寒,莫不令人心旷神怡。“未老莫还乡,还乡须断肠”,还有什么能令人如此刻骨铭心的呢?

    ③行走山水间,凝眸处,都是漂泊者载酒江hu的萍踪浪迹。这些官场失势、情场失意、商场失利的文人,经过一番红尘的折腾后,身心俱疲,志坠青云,愤世伤心之余,一脚踏进江hu,寄情山水,托志万象,逍遥去也。“落魄江hu载酒行,楚腰纤细掌中轻;天子呼来不上船,自言臣是酒中仙。”那是何等的桀傲放荡,自在快活!山的伟岸强劲,山的独立异世,山的傲笑天地风云,水的__________,水的__________,水的__________,又恰恰迎合了文人的秉性,响应了他们内在的精神理想,使之思想情怀找到了可供寄托、归依和宣泄的家园,山水成为他们驰骋个性精神、张扬生命理想最自由的场所和最广阔的天地。他们临风弄月的古韵行呤,飞龙舞凤的斑驳陈迹,为自然的山水附丽了浓郁得化不开的人文色彩,一山一水、一园一亭、一花一草、一石一木,因此都具有了强烈的生命激情、历史印迹、文化渊源和传奇色彩。安徽宣城外的那座不起眼的小山丘,因李白偶尔一句“相看两不厌,只有敬亭山”而成为名胜;而绍兴城南一处普通的私家园林,因陆游遗恨千载的《钗头凤》和《沈园诗》,令古往今来多少性情中人不顾山迢水遥,争相一睹为快;最典型莫过于岳阳楼,一楼何奇?却因“杜少陵五言绝唱,范希文两字关情,腾子京百废俱兴,吕纯阳三过必醉”而声名大噪。人文精神对山水的浸淫和提升,给中国山水罩上了玄奥的文化青衫,弥漫了宗教般的神秘气氛,让崇尚自然,在自然中寻找生命价值和追求生命真谛的西方人,拍痛了脑袋也解读不透其中的奥秘。

    ④“文章乃案头之山水,山水乃地上之文章”。一座好山或一川好水,_______________。畅游好山好水,_______________。所谓“仁者乐山,智者乐水”,那样的赏心乐事,是粗鄙者不会为之的。山水入诗,更增诗情,山水入画,更添画意,山水乃诗画之源。山水有钟灵秀气而生才子佳人,这大概属于中国古老的风水学说了。

    ⑤好山好水是我们的物质财富,更是我们的精神财富。很欣赏“一生好入名山游”的那份潇洒与浪漫,憧憬着有朝一日,能实现儿时的梦想,游遍普天之下的名山大川。

同类题5

阅读理解

    The wedding tradition of “something old, something new, something borrowed and something blue” has been around for hundreds of years. The tradition of carrying or wearing one of each item is said to bring luck and fortune to the newly married couple. Have you ever stopped to think what the saying really means? What is its origin and what does each item represent?

    The original saying dates back to the Victoria times and states, “something old, something new, something borrowed, something blue and a silver sixpence in your shoe.”

    Something old   A bride may wear or carry something old to represent her continued ties to her family and her old life. Many brides wear a piece of family jewelry as their old item. Some brides wear the wedding dress worn by their mother or grandmother. In many cases, something old may also be something borrowed.

    Something new   Wearing something new is supposed to represent success and hope in the bride's new life and in her marriage. If the bride purchased her wedding dress new, it may represent her new item, but any item that is new may be used. Something “new” is usually the easiest kind to fill.

    Something borrowed   The borrowed item should be something borrowed from a friend that is happily married. It is said that their happiness will rub off on you and bring lasting happiness to your marriage. Some brides borrow an item of clothing, a piece of jewelry, a handkerchief or perhaps a beaded(带珠子的) purse.

    Something blue Wearing something blue dates back to ancient times when a blue wedding dress was worn to represent purity, fidelity and love.

    Silver sixpence   Placing a silver sixpence in the bride's left shoe is said to be a symbol of wealth. This not only refers to financial wealth, but also a wealth of happiness and joy throughout her married life. Since most brides probably don't even know what a sixpence is, this part of the tradition is not used very often in modern times. However, if a bride would like to include it in her wedding, she can purchase a silver sixpence from many companies that sell bridal supplies such as garters(袜带) and invitations.