题干

下列关于基因、DNA和染色体三者关系的叙述,错误的是(  )

A:染色体的化学成分主要包括DNA和蛋白质

B:DNA是主要的遗传物质

C:生物的性状是由染色体上的基因控制的

D:一个DNA上通常只含有1个基因

上一题 下一题 0.0难度 选择题 更新时间:2018-01-11 03:22:45

答案(点此获取答案解析)

D

同类题3

        Some people think only school children do not agree with their parents, however, it is not true.   1  is a problem for parents and children of all ages. If it's hard for you to communicate with your   2 , don't worry about it. Here is some advice for you to bridge the generation gap (代沟).
        Don't argue with your parents. Don't get to your parents when you are   3 . Your parents probably won't   4your ideas if you are shouting at them. And you can't express yourself  5  if you are angry. Go someplace to cool off. Make sure you understand why you are unhappy. Then think about what you want to   6 to your parents. If you don't think you can speak to them at the moment,  7  writing a letter.
        Try to reach an agreement. Sometimes you and your parents  8  on something. You can keep your disagreement and try your best to   9 each other. Michael's mother didn't agree with him about buying a motorcycle. They  10  over it. But they finally came to an agreement. Michael bought the motorcycle, but only   11it on certain days.
      Of course, your parents might refuse to agree on something. In these  12 , it is especially   13to show love and respect to them. Showing respect will keep your relationship with your parents strong.
         Talk about your  14 . The values of your parents are probably different from those of your own. Tell your parents what you 15  about, and why. Understanding your values might help them see your purposes in life.
      A good relationship with your parents can make you a better and happier person. It is worth having a try!