题干

如图为某细菌mRNA与对应的翻译产物示意图,相关叙述正确的是(  )
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A:一分子mRNA有一个游离磷酸基团,其他磷酸基团均与两个核糖相连

B:mRNA上的AUG是翻译的起始密码,它是由基因中的启动子转录形成

C:在该mRNA合成结束后,核糖体才可以与之结合并开始翻译过程

D:一个mRNA有多个起始密码,所以一个mRNA可翻译成多种蛋白质

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答案(点此获取答案解析)

A,D

同类题4

根据短文内容,从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。

    Moving into a new home in a new neighborhood is an exciting experience. Of course, you want to make sure that you become an accepted and valuable part of your new neighborhood. The easiest way to accomplish this is to make sure you conduct yourself as a good neighbor should.____

    Perhaps one of the most important things you can do as a good neighbor is to keep your property(房产) neat, clean, and in good repair. ____By choosing to keep the outside of the home in great shape, you will help to improve the look and feel of the area.

    Second, take the overall appearance of the neighborhood seriously. When going for a walk. Take along a small garbage bag. ____This small act will let your neighbors know that you care about the area.

    ____ If a neighbor is going to be out of town, offer to collect mail and newspapers. If a neighbor suffers an illness, offer to do the grocery shopping. Let them know you are there to help in any way this acceptable, while still respecting the privacy of your neighbor.

    ____By following the basic rules of respecting others, taking care of what belongs to you, and taking pride in the appearance of the neighborhood in general, you will quickly become a good neighbor that everyone appreciates.

A. In general, keep an eye on their property while they are gone.

B.A good neighbor is also one who likes to help out in small ways.

C. Being a good neighbor is more or less about considerate behavior.

D. Sometimes neighbors may go to the supermarket together to do shopping.

E. Should you come across waste paper thrown out of a passing car, pick it up.

F. People tend to lake pride in keeping everything in their street fresh and inviting.

G. Here are a few tips to help you win over everyone in the neighborhood quickly