题干

如图所示的四个方框依次代表细菌、衣藻、木耳、蓝藻,
其中阴影部分表示它们都具有的某种物质或结构。下列
哪项不属于这种物质或结构                (   )

A:核糖体

B:RNA

C:DNA

D:染色体

上一题 下一题 0.0难度 选择题 更新时间:2017-07-21 11:49:46

答案(点此获取答案解析)

D

同类题3

阅读下面文言古诗,完成下面题目。
       陈思王植字子建。年十岁余,诵读诗、论及辞赋数十万言,善属文。太祖尝视其文,谓植曰:“汝倩人邪?”植跪曰:“言出为论,下笔成章,顾当面试,奈何倩人?”时邺铜爵台新成,太祖悉将诸子登台,使各为赋。植援笔立成,可观,太祖甚异之。性简易,不治威仪,舆马服饰,不尚华丽。每进见难问,应声而对,特见宠爱。太祖征孙权,使植留守邺,戒之曰:“吾昔为顿邱令,年二十三。思此时所行,无悔于今。今汝年亦二十三矣,可不勉与!”植既以才见异,而丁仪、丁廙、杨修等为之羽翼。太祖狐疑,几为太子者数矣。而植任性而行,不自雕励,饮酒不节。文帝御之以术,矫情自饰,宫人左右,并为之说,故遂定为嗣。植尝乘车行驰道①中,开司马门②出。太祖大怒,公车令坐死。由是重诸侯科禁,而植宠日衰。太祖既虑终始之变,以杨修颇有才策,而又袁氏之甥也,于是以罪诛修。植益内不自安。二十四年,曹仁为关羽所围。太祖以植为南中郎将,行征虏将军,欲遣救仁,呼有所敕戒。植醉不能受命,于是悔而罢之。
                                                                                                                         (节选自《三国志•陈思王曹植传))
      注:①驰道:也称御道,专供天子行车之路。③司马门:即宫门,每门有司马主管,故名。

同类题4

      Once there was a little girl who lived in a small, very simple, poor house on a hill. From there she could see across the valley to a wonderful house high on the hill on the other side. This house had golden windows, so golden and shining that the little girl would dream of how magic it would be to grow up and live in a house with golden windows instead of an ordinary house like hers. She wanted to live in such a golden house and dreamed all day about how wonderful and exciting it must feel to live there.
       When she got to an age and got enough skill and sensibility to go outside, she asked her mother if she could go for a ride outside the gate and down the lane. After pleading with her, her mother finally allowed her to go, insisting that she should keep close to the house and not wander too far. The day was beautiful and the little girl knew exactly where she was heading! Down the lane and across the valley, she got to the gate of the golden house across on the other hill.
       As she arrived, she focused on the path that led to the house and then on the house itself. She was so disappointed as she realized all the windows were ordinary and rather dirty, reflecting(反映出) nothing other than the sad neglect of the house that was derelict(废弃的).
So sad she didn't go any further and turned, and heart broken. As she glanced up she saw a sight to amaze her. There across the way on her side of the valley was a little house and its windows glistened golden as the sun shone on her little home.
      She realized that she had been living in her golden house and all the love and care she found there was what made her home the “golden house”. Everything she dreamed was right there in front of her nose!