题干

下列关于细胞中元素和化合物的叙述,错误的是(  )

A:氨基酸分子中若有S元素,则S元素一定存在于R基中

B:胆固醇属于脂质,是构成动物细胞膜的重要成分

C:糖原和纤维素的基本组成单位都是葡萄糖

D:C是构成细胞内化合物的骨架

上一题 下一题 0.0难度 选择题 更新时间:2012-02-10 11:47:23

答案(点此获取答案解析)

D

同类题3

阅读下列短文,从下面每小题的A、B、C、D四个选项中选出最佳选项

    Hershey chocolate is famous around the world. The man who began it, Milton Hershey, was glad to share the fruits of success with others.

    Milton Hershey was born on 13 September, 1857. In 1871, he started working for a local printer. But he didn't like this kind of work and ended the job quickly. Later, he helped make candy in a factory. After a few years, Milton knew that he was a good candy maker and he wanted to start his own candy business. In 1886, he started a caramel (焦糖) business, and four years later his business was very successful. After seeing how chocolate was made. Milton loved it right away. He got married and sold the caramel company for one million dollars and opened up a chocolate factory.

    Milton built a town with houses, schools, and stores so the workers in his factory could live nearby. As Milton made more money, he built a school for orphans (孤儿). When his wife died, Milton took all of his money and gave it to the school to help those children. He also set up the M. S. Hershey Foundation to help people get an education.

    Milton Hershey died in 1945, but the world remembers him for not only making chocolate, but for his work to help people. He is someone who built a town and helped people get jobs. He is someone who built a school for children who did not have families. He is someone who helped those who were sick and someone who made that chocolate, that delicious chocolate which most of us throughout me world enjoy.