问题
选择题
某条多肽的相对分子质量为3180，若氨基酸的平均相对分子质量为120，如考虑终止密码子，则编码该多肽的基因长度至少是[ ]
A．90对碱基
B．93对碱基
C．96对碱基
D．99对碱基
答案
答案：C
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某条多肽的相对分子质量为3180，若氨基酸的平均相对分子质量为120，如考虑终止密码子，则编码该多肽的基因长度至少是[ ]
A．90对碱基
B．93对碱基
C．96对碱基
D．99对碱基
答案：C
| Cloze. | ||||
| Good afternoon, and welcome to England. We hope that your visit here will be a 1 one. Today I would like to 2 your attention to a few of our laws. The first one is about drinking. Now you may not buy alcohol drinks in this 3 if you are under 18 years of age, and your friends may not buy it for you, 4 . Secondly, surroundings. Enjoy yourselves by all means, but please don't make a lot of noise, particularly at night. We ask you to 5 other people who may wish to be 6 . Thirdly, crossing the road. Be careful, traffic moves on the 7 side of the road in this country. Use pedestrian crossings and do not take any chances when crossing the road. My next point is about litter (throwing away waste material in a public place). It is an offence (违法) to drop litter in the street. When you have something to throw away, please put it in your 8 and take it home, or put it in a litter bin. Finally, as regards smoking, it is 9 the law to buy cigarettes if you are under 16 years of age. I'd like to finish by saying that if you require any sort of help, you should 10 the local police station. | ||||
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