问题 实验题

(6分)观察细菌的结构图回答问题:

(1)遗传物质存在于图中序号[    ]所指的结构中。

(2)这种细菌会运动吗?答:     。这是根据图中[  ]         所代表的结构作出判断的。

(3)当[③]所指的结构增厚时,细菌能够形成休眠体叫         ,以抵抗不良环境。

(4)细菌的结构与植物细胞的结构的主要区别是:细菌没有_______、_________和液泡。

答案

(1)【①】(2)会, 【⑥】鞭毛。 

(3)芽孢。 (4)成形的细胞核、叶绿体。(顺序可调换)

题目分析:(1)细菌的基本结构有最外层③细胞壁、紧靠细胞壁的是②细胞膜、在细胞膜和DNA之间是⑤细胞质和细胞中间是①DNA集中的区域,有的细菌有长长的⑥鞭毛,有的在细胞壁外面还有较厚的④荚膜,没有成形的细胞核,没有叶绿体,细胞核是遗传的控制中心,里面有遗传基因,细菌没有核膜,只有遗传物质集中的部位,故细菌的遗传物质存在于①处所指结构DNA集中的区域。

(2)该小细菌有⑥鞭毛,可以借助于鞭毛的摆动运动,因此这种细菌会运动。

(3)当③细胞壁增厚的时候,细菌能够形成一个椭圆形的休眠体,叫做芽孢,以抵抗不良环境。

(4)细菌的基本结构有细胞壁、细胞膜、细胞质和DNA集中的区域,没有成形的细胞核、没有叶绿体,而植物细胞的结构有细胞膜、细胞质、细胞核、液泡、叶绿体,因此细菌与植物细胞的主要区别是细胞内没有成形的细胞核、叶绿体和液泡。

点评:此题是基础知识题,难度一般,解题需要熟练掌握细菌的结构、生活特性、营养方式、与植物细胞的区别。

阅读理解

Every once in a while, it is necessary to take a step back in order to take a long, hard look at where we are in our lives. At this point, it is good to ask yourself a bunch of critical questions. Are you at the point in your career where you want to be ? Have you so far accomplished all of your goals in life ? If so, then maybe it is time to make goals that stretch yourself a bit more. If you have not accomplished your goals in life, then perhaps you have made the mistake of setting too many goals or trying to accomplish them at an unnaturally fast pace.

It is necessary to set reasonable, intelligent goals in order to succeed in life. Do not be unrealistic because life is not a fairy tale. But you should try to recognize what you want, and to be as specific as possible when attempting to visualize(形象化) or otherwise express what your goals in life are.

In order for a goal to sufficiently motivate you, it needs to be a major one. The bigger your goals are, then the more motivated you will need to be to work towards accomplishing them. If you want, for example, to be the greatest concert pianist, in the world, then you are going to find yourself a lot more motivated than you would be if your goal were merely to, say, play a couple of Beethoven pieces extremely well. If you are a beginner, then no doubt mastering those tough songs is a very intelligent and realistic goal to set. But if that is your only goal as a pianist, then you will stop growing as a pianist once that goal has been achieved. This is why it is necessary to constantly stop and re-evaluate our goals so that we are aware of what they are, and thus stay motivated.

小题1:From the passage, if your goals have all been achieved, you should then ______.

A.ask yourself some serious questions

B.take a hard look at your success

C.set some other intelligent goals

D.stretch yourself to relax小题2:By saying “life is not a fairy tale”, the author suggests that you should ________ .

A.set as big a goal as possible

B.try hard to realize your dream

C.make your goals practical

D.abandon all your ambitions小题3: To perform several Beethoven pieces well is a goal that _______.

A.is not suitable for the pianist

B.is appropriate for a beginner

C.stops you from growing as a pianist

D.is very easy to achieve小题4:What is the best title for the passage ?

A.Set Intelligent Goals for Yourself

B.Try to Accomplish Your Goals

C.Get Yourself More Motivated

D.Goals Help You to Succeed

单项选择题