您所在的当前位置：高中生物试题 >

细胞中的元素

> 下列哪一实例能够证明微量元素是生命活动所必需的 [ ] A．Mg是叶绿素的组成部分 B．油菜缺少B时只开花不结果 C．哺乳动物血液中钙盐含量太低，会抽搐 D．缺P会影响ATP的合

问题：

发布时间：2024-09-07

下列哪一实例能够证明微量元素是生命活动所必需的
[ ]
A．Mg是叶绿素的组成部分
B．油菜缺少B时只开花不结果
C．哺乳动物血液中钙盐含量太低，会抽搐
D．缺P会影响ATP的合

参考答案：

提问用户：Gf***Ewq

可能感兴趣的题目：

1 Wang Zubo was against my suggestion while Wang Xing was _____ it. [ ] A. in honor of B. in search of C. in favor of D. in charge of
2 下图表示人体生命活动调节过程，请据图判定下列说法错误的是 [ ] A．假如细胞1是甲状腺细胞，细胞2可以表示垂体细胞 B．假如细胞1是垂体细胞，细胞2可以表示甲状腺细胞 C．该图可以表示激素、CO 2等化学物质的调节过程 D．细胞1的分泌物之所以能与靶细胞特异性结合是由于靶细胞有特异性的受体
3 某烃的分子式为C 8H 10，不能使溴水褪色，但可使酸性KMnO 4溶液褪色，则此烃的结构有 A．2种 B．3种 C．4种 D．5种
4 定义区间的长度为 .若是函数的一个长度最大的单调递减区间，则 A．, B．, C．, D．,
5 第二次世界大战后，世界经济开始朝着区域集团化的方向发展，由此诞生了一系列形式多样的经济区域集团化组织，但不包括（） A．欧洲经济共同体 B．亚太经合组织 C．北美自由贸易区 D．上海合作组织
6 一名六旬老人17 年来掏出近40万元血汗钱，无偿资助了400名贫困学生，但有的孩子得到资助后甚至从没给他写过一封信，打过一个电话。可老人却说：“把助学金亲手交给孩子们，这事就算完了，再想要报答没意思，那叫自私。” 运用历史唯物主义相关原理辨析：没有回报的道德活动是没有意义的。
7 下列命题中： ①若 a • b =0，则 a = 0 或 b = 0 ； ②若不平行的两个非零向量 a ， b 满足| a |=| b |，则（ a + b ）•（ a - b ）=0； ③若 a 与 b 平行，则 | a • b |=| b • a |； ④若 a ∥ b ， b ∥ c ，则 a ∥ c ；其中真命题的个数是（　　） A．1 B．2 C．3 D．4
8 第三部分：阅读理解（共20小题；每小题2分，满分40分）阅读下列短文，从每题所给的四个选项（A、B、C和D）中，选出最佳选项，并在答题卡上将该项涂黑。 For Senior 3 students, choosing which college to attend can be the most exciting and thrilling time in their entire school lives. This is also true for an American girl named Melanie in the film, College Road Trip, which was released in the US on March 7. Melanie’s dad, James Porter, is the chief of police for a Chicago suburb. Incredibly security obsessed（困扰）, he wants Melanie to attend nearby Northwestern University, where she’s already been accepted. But Melanie, 17, really wants to go to Georgetown in Washington, D.C., where she’s been wait-listed. When she gets an unexpected interview, she decides to take a road trip with a few close female friends. Melanie believes it is her first step toward adulthood. But despite the fact that this trip is “girls only”, James isn’t comfortable with the prospect of his little princess exploring the world without him. He wants to protect her. James joins the girls and hopes he can convince her to go to Northwestern. While Melanie’s father only has the best of intentions, his presence leads to an endless series of comic encounters. After following their faulty GPS device deep into the backwoods, James and Melanie discover her little brother and his pet pig have been hiding in the spare tire compartment（隔间）. What should be a simple tire change results in the expensive car rolling down a mountain, forcing them to hike to a nearby hotel. There the pig ruins an outdoor wedding reception after eating an entire bag of coffee beans. All these disasters add spice to their trip while along the way a father and a daughter finally get the chance to really talk to each other. The film explores the parent-child relationship in a comic way: The discrepancy（不同） between how close James thinks he is to Melanie and how little he actually knows of her plans makes us laugh first and then think. All parents, whether they have college students or not, can relate to the bittersweet realization that their kids are growing up. Like what Melanie and James have done in the film, we all can find the delicate balance between staying connected and letting go. 51．According to the passage, which of the following is TRUE? A．It’s unclear whether Melanie could be accepted by Northwestern University. B．Northwestern University isn’t so famous as the university in Washington D.C.. C．There is no hope that Melanie will be accepted by the university in Georgetown. D．Melanie’s father prefers her to stay not too far away from him. 52．We can infer from the passage that ________. A．their car rolled down the mountain, ruining the wedding reception B．a hotel was destroyed by Melanie’s brother and his pet pig C．Melanie and her father got to understand each other better after so many encounters D．the girls had to give up their trip because of the incidents on the way 53．What does the underlined word “released” mean? A. set free B. known C. shown D. developed 54．The main purpose of the passage is to _______. A．introduce the newly-released film B．call on parents to learn to balance the relationship with their children C．tell a story which happened between an American girl and her father D．explore the differences in parent-child relationship between the west and the east
9 列四地为我国主要平原，其名称依次是 A．汾河平原、江汉平原、湟水谷地、河套平原 B．宁夏平原、江汉平原、渭河平原、成都平原 C．宁夏平原、渭河平原、江汉平原、成都平原 D．汾河平原、渭河平原、江汉平原、河套平原
10 为了研究过山车的原理，物理小组提出了下列的设想；取一个与水平方向夹角为37 0、长为L=2.0m的粗糙的倾斜轨道AB，通过水平轨道BC与竖直圆轨道相连，出口为水平轨道DE，整个轨道除AB段以外都是光滑的。其中AB与BC轨道以微小圆弧相接，如图所示。一个小物块以初速度v 0=4.0m／s，从某一高处水平抛出，到A点时速度方向恰好沿AB方向，并沿倾斜轨道滑下。已知物块与倾斜轨道的动摩擦因数μ=0.50（g取10m／s 2、sin37 0=0.6，cos37 0=0.8）求：（1）抛出点与A点的高度差；（2）要使小物块不离开轨道，并从水平轨道DE滑出，求竖直圆弧轨道的半径应该满足什么条件；（3）为了让小物块不离开轨道。并且能够滑回倾斜轨道AB，则竖直圆轨道的半径应该满足什么条件？并求出滑块在AB上运动的总路程。