题干

下图为结肠癌发病过程中细胞形态和部分染色体上基因的变化。下列表述正确的是(  )

A:图示中与结肠癌有关的基因互为等位基因

B:结肠癌的发生是多个基因突变累积的结果

C:图中染色体上的基因变化说明基因突变是随机和定向的

D:上述基因突变可传递给子代细胞从而一定传给子代个体

上一题 下一题 0.0难度 选择题 更新时间:2013-09-26 05:32:30

答案(点此获取答案解析)

B

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    26-year-old Anna Cherdantseva, from the city of Ufa in Russia, is a full-time employee of a furniture company, spending up t0 10 hours every day trying out new sofas for comfort and safety.

    Last month, Russian furniture giant M25 Group announced that it was taking application for a new position. Although all new products are tested in a specialized laboratory, management decided that in order to better meet the needs of consumers it needed some feedback(反馈) on real-life use of its sofas.  In just a few days, M25 received over 5,000 job applications.

    "We selected candidates in several stages," M25 Group spokesperson Anastasia Russkih said.  "Initially we checked their CVs, and then we let them tell us why they wanted the job. " Eventually, the furniture company shortlisted just 7 candidates, out of which Anna Cherdantseva, a 26-year-old marketing expert, proved to be the most suitable for the job.  "It was a real fight for my dream job," Anna said after getting selected.

    Despite describing herself as an active person, Cherdantseva says that spending about l0 hours a day sitting on sofas doesn't sound bad at all.  "Of course I will spend a lot of time on new sofas.  The more time I spend on them, the better it will be for my work," she told reporters.

    Anna Cherdantseva is at present on a three-month probation(试用期) at M25, but the company claims that as long as she proves to be up to the task, they plan on offering her a permanent position The young woman will receive a monthly salary of 56,000 rubles( $l,000) for the first three months.  It's not so bad for sitting on the job.