题干

关于细胞膜结构和功能的叙述,错误的是(  )

A:脂质和蛋白质是组成细胞膜的主要物质

B:细胞能识别病原体主要依赖于细胞膜上的糖蛋白

C:甘油是极性分子,所以不能以自由扩散的方式通过细胞膜

D:细胞产生的激素与靶细胞膜上相应受体的结合可实现细胞间的信息传递

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答案(点此获取答案解析)

C

同类题3

阅读短文, 从每题所给出的(A、B、C、D)四个选项中选出最佳选项。

Michael Rossi is the Internet favorite Dad right now.

Mr. Rossi, a father from Philadelphia, recently took his kids, Jack and Victoria, to Boston for three days during the school term. But Rydal Elementary School, one of the oldest schools in Boston, doesn't accept family holidays as an excuse for their absence and give them a warming notice. So Mr. Rossi wrote a letter to the school, which has been shared by thousands of parents online.

   Dear Mrs. Marbyry,

   While I am thankful for your concern for our children and the best education our kids receive from you, I can promise you they’ve learned as much in the three days we were in Boston as they would in a whole year in school.

   Although they missed an important test, they learned about something more important for them, especially for their future.

   They experienced first –hand the love and support form thousands of other people with a common goal. At the marathon(马拉松) , which is known as the most difficult one in the world, they watched runners with disabilities work together to collect money for children in poor areas.

In addition, our children walked the Freedom Trail, visited the site of the Boston Tea Party and the graves of several great pioneers of America. These are thing they WILL learn in school a year or more from now.

   We truly love our school and teachers. But I wouldn't hesitate (犹豫) to pull them out of school again for an experience like the one they had this time.

   Thank you for your time.

Sincerely,

Michael Rossi