题干

某科研小组对禽流感病毒遗传物质进行如下实验:

实验原理:(略)

实验目的:探究禽流感病毒遗传物质是DNA还是RNA.

材料用具:显微注射器,禽流感病毒核酸提取物,活鸡胚,DAN酶,RNA酶,蛋白酶.

实验步骤:

第一步:取等量活鸡胚两组,用显微注射技术分别向两组活鸡胚细胞中注射有关物质.

第二步:在适宜条件下培养.

第三步:分别从培养后的鸡胚中抽取样品,检测是否产生禽流感病毒.

实验相关内容如下表:


注射的物质

实验现象预测(有无禽流感病毒)

相关判断(禽流感病毒的遗传物质)

第一组

核酸提取物+

 DNA酶 

1.如果有

1.则RNA是遗传物质

2.如果无

2.则DNA是遗传物质

第二组

核酸提取物+

 RNA酶 

3.如果有

3.则DNA是遗传物质

4.如果无

4.则RNA是遗传物质

(1)完成表格中有关内容的填空.第一组核酸提取物+____ ,第二组核酸提取物+____ .

(2)若禽流感病毒的遗物物质为DNA,则该DNA在鸡胚细胞中复制的原料是 ____ ,需要的酶有____ ,能量为____ .

(3)若禽流感病毒的遗物物质为RNA,水解后生成的最终产物是____ ,禽流感病毒的遗传信息储存在____  上.

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答案(点此获取答案解析)

DNA酶,RNA酶,4种脱氧核苷酸,解旋酶和DNA聚合酶,ATP,核糖、碱基、磷酸,RNA(或核糖核酸)

同类题4

阅读理解

    Flying devices called drones(无人机) may be one of the most important technologies of the future.

    The number of jobs for people who know how to design, build and control them is increasing. Because of this increase, several U.S. universities have started offering degrees in unmanned aircraft systems, or UAS.

    One of these universities is the University of Washington in Seattle. Ward Handley is seeking a master's degree in UAS at the university. When the drone program first began, he did not think it was a good idea. “Drones can be used to invade privacy(侵犯隐私).” He said. But later, Handley changed his opinion. He said, “I think there are good enough purposes for them.”

    The FAA (the part of the U.S. government that controls air travel and traffic) is creating new rules to control the use of drones, however. A new law requires drone owners to register(登记) their drones. People who do not register their drones could face fines of up to US$20,000.

    The new rules may also present problems for students. One problem is finding a legal place to fly.

    Students at Blue Mountain Community College fly inside the college gym. In Seattle, University of Washington students test their drones in a big room.

    Christopher Lum, a scientist at the University of Washington, helps students explore how drones can safely share the sky with regular aircraft. Lum explained why they test drones inside a building, “We need to register our aircraft and get permission to fly outside. That process can take months.”

    At this time, Kansas State University is the only school with permission to offer unmanned aircraft flight classes to students outside. The FAA selected Kansas State University and 15 other universities to be part of a national research group.

    Lum and some of his students recently moved their research to Australia. Australia has fewer rules limiting drones. A professor at Western Washington University also took his department's drones to Canada for the same reason.

同类题5

阅读下面的文言文,完成下列各题。

故事两则

    向有友人馈朱鲫①于孙公子禹年②,家无慧仆,以老佣往。走送之,及门,倾水出鱼,索盘而进之。及达主所,鱼已枯毙。公子笑而不言,以酒犒佣,即烹鱼以飨既归,主人问:“公子得鱼,颇欢慰否?”答曰:“欢甚。”问:“何以知之?”曰:“公子见鱼便欣然有笑容,立命赐酒,且烹数尾以犒小人。” 主人骇甚,自念所赠颇不粗劣,何至烹赐下人。因责之曰:“必汝蠢顽无礼,故公子迁怒耳。”佣扬手力辩曰:“我固陋拙,遂以为非人也!登公子门,小心如许,犹恐筲斗不文,敬索盘出,一一匀排而后进之,有何不周详也?”主人骂而遣之。

    灵隐寺僧某,以茶得名,铛臼皆精。然所蓄茶有数等,恒视客之贵贱以为烹献;其最上者,非贵客及知味者,不一奉也。一日,有贵官至,僧伏谒甚恭,出佳茶,手自烹进,冀得称誉。贵官默然。僧惑甚,又以最上一等烹而进之。饮已将尽,并无赞语。僧急不能待,鞠躬曰:“茶何如?”贵官执盏一拱曰:“甚热。”                                    (取材于蒲松龄《聊斋志异》)

【注释】①朱鲫:红鲫鱼,一种名贵的观赏鱼。②孙公子禹年:孙禹年,淄川人,清代顺治年间兵部尚书之子。 ③飨:用酒食款待。④非人:不懂事理的人。⑤筲斗(shāo dǒu)不文:用小水桶盛着鱼,不够体面。筲斗,小水桶。⑥铛臼(chēng jiù):煮茶用具。