题干

“超级细菌”NDM-1有蔓延全球的趋势,感染者已达数百人,它含有一种被称为NDM-1的基因,对现有的绝大多数抗生素具有抗性。下列有关“超级细菌”的叙述正确的是:

A:超级细菌的产生可能是普通细菌基因突变所致

B:超级细菌不具有核膜和细胞器

C:染色体是超级细菌遗传物质的主要载体

D:可用纤维素酶和果胶酶除去该细菌的细胞壁

上一题 下一题 0.0难度 选择题 更新时间:2019-06-23 03:09:37

答案(点此获取答案解析)

A

同类题5

The teacher stood before his class of 30 students and was going to hand out the final exam papers.“I know how hard you have all worked to get ready for this test.” he said.“And because I know you are all able to understand these questions.I am ready to offer a B to anyone who would prefer not to take the test.’’
A number of students jumped up to thank the teacher and left the classroom.The teacher looked at the rest students and said.“Does anyone else want to get a B? This is your last chance.”Two more students decided to go.Seven students stayed.The teacher then handed out the papers.There were only three sentences on the paper: Congratulations! You have received an A in this class.Keep believing in yourself.
I never had a teacher who gave a test like that.but I think that it is a test that any teacher could and should give.Students who do not have confidence in what they have learned are B students at most.
The same is true for students in real life.The A students are those who believe in what they are doing because they have learned from both successes and failures.They have learned life’ s lessons, whether from school education or from events in their lives,and have become better people.Scientists say that by the age of eight,80% of what we believe about ourselves has already been formed.You are a big kid now and you realize that you have some limits(局限).However,there is nothing you can’t do or leant to be.Sir Edmund Hillary, the first person to reach the top of Mount Qomolangma (珠穆朗玛峰)said,“We do not conquer the mountain.but ourselves.”