题目

下列关于组成细胞化合物的叙述，不正确的是A.蛋白质肽链的盘曲和折叠被解开时，其特定功能并未发生改变B.RNA与DNA的分子结构相似，由四种核苷酸组成，可以储存遗传信息C.DNA分子碱基的特定排列顺序，构成了DNA分子的特异性D.胆固醇是构成细胞膜的重要成分，在人体内参与血液中脂质的运输 答案：A 解析：肽链的盘曲和折叠构成具有一定空间结构的蛋白质，不同结构的蛋白质，具有不同的功能，因此蛋白质肽链的盘曲和折叠被解开时，其功能肯定发生改变；RNA与DNA的分子结构相似，由四种核糖核苷酸组成，可以储存遗传信息；DNA分子碱基的特定排列顺序，构成了DNA分子的特异性；胆固醇是构成阅读理解，根据短文用所给短语把句子补充完整。In the future, life will be much better. Maybe there will be vision phones (可视电话) in every family. People can have a medical examination without a doctor or a nurse in the room. If people want to do some shopping, they do not need to leave their homes. They will go shopping online. And what about education (教育)？There will be more educational programs on TV, even on the Internet.Children don't need go to school every day. They can study at home.Each family will have a robot. Robots will help people with their housework.Maybe some people will go to the moon for a holiday and some people can live under the sea in hot summer.for a holiday at home in hot summer robots TV and the Internet（1）If you are ill, you will see the doctorin the future.（2）In the future,will help people do the housework.（3）In the future, students will study on.（4）Some people will live under the sea.（5）People will go to the moon.