题目

DNA分子的复制、转录和翻译分别形成A. DNA、RNA、蛋白质 B. DNA、RNA、氨基酸C. DNA、RNA、核糖体 D. 核苷酸、RNA、蛋白质 答案：【答案】A【解析】考查DNA分子的复制、遗传信息的转录和翻译，要求考生识记DNA分子复制的概念；识记遗传信息转录和翻译的过程、条件、场所和产物等基础知识，再根据题干要求选出正确的答案即可。DNA复制是以亲代DNA分子为模板合成子代DNA分子的过程；转录是以DNA的一条链为模板合成RNA的过程；翻阅读短文，根据短文内容回答问题。Think about the distance（距离）you traveled in the last six months of your life. About how many miles（kilometers）did you go？Lucid went quite a distance. On March 22, 1996，she started a journey. She traveled 188 days, 4 hours，and 14 seconds in total. This is a little over six months. So what distance did Lucid travel? She went 75.2 million miles（1,203,200,000 kilometers）!How could Lucid go so far? How could she journey so fast? Lucid was an American astronaut and she was in space. She lived on a space station. The space station was the Russian space station Mir. She lived and worked with two Russian astronauts.On Mir,it was hard for Lucid to know what day it was.Why?Mir did not stay in one place.It orbited the Earth.It went around the Earth.Mir’s orbit meant that darkness did not mean the day was over. Darkness fell many times during a 24-hour period.Darkness fell about every 45 minutes. Lucid did something to help her remember what day it was. She wore pink socks on every seventh day. The pink socks reminded Lucid about something else,too. The pink socks helped Lucid remember that Jell-O would be served for dinner. On Mir,Jell-O was a special treat. It was only served on Sunday.Lucid worked hard to deserve the honor of working on Mir. She went to school for a long time.She was one of the first six women to be accepted into the astronaut-training program. She flew on several American missions. When accepted for Mir, she had to learn Russian in less