问题 选择题

下列不具有细胞结构的生物是                                       

A.衣藻

B.草履虫

C.SARS病毒

D.细菌

答案

答案:C

题目分析:病毒没有细胞结构,由蛋白质的外壳和里面包裹的一小段遗传物质组成,病毒不能独立生活,必须生活在其他生物的细胞内,病毒只能寄生在活细胞内,靠自己的遗传物质中的遗传信息,衣藻是单细胞藻类植物,草履虫是单细胞动物,细菌是单细胞生物。

点评:此题为基础知识题,解答此题的关键是熟练掌握病毒的特点。

不定项选择
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(B)

Now I'd like to talk to you about your final exam. The exam will be held next Thursday, the last day of the exam week. Remember to bring two of three pens in case you run out of ink. And unlike the mid-term exam, this test will not include multiple --- choice questions; it will consist entirely of essay. You'll have to answer three of the five essay questions. The exam will be comprehensive, which means you'll be responsible for all of the subject matters we covered in class this term, I would suggest you review your mid-term exam as well as textbooks and your class notes. The final exam will count as 50 percent of your grade of the course. The research project will count as 20 percent and the mid-term exam 30 percent. I'll be in my office almost all day next Tuesday. If you run into any problems, please drop in. Good luck to you and I'll see you on Tuesday.

59. . What will be included in the exam?

A. There will be only multiple-choice questions.

B. The exam will contain both multiple-choice and essay questions.

C. The exam will have an oral and a written section.

D. There will be only essay questions.

60.Why does the teacher call the exam comprehensive?

A. It will be easy to understand.

B. Students will be tested on all the material discussed in class.

C. It will cover topics from a wide variety of subjects.

D. Students must complete all parts of it.

61. When was this talk most likely given?

A. During the first week of class               B. During mid-term week

C. On the last day of class                     D. On the last day of exam week