问题 多项选择题

下列关于蛋白质三级结构的叙述,哪些是正确的()。

A.一条多肽链和一个辅基连成的紧密球形结构

B.蛋白质分子中含有α-螺旋,ß-片层折叠和ß-转角

C.其辅基通过氨基酸残基与分子内部相连

D.大部分非极性基团位於蛋白质分子内部

答案

参考答案:B, D

阅读理解

A woman was collecting money for a church charity. The money she collected was going to be given to poor children who had no parents to take care of them. She went from apartment to apartment and from house to house. She knocked on doors and asked for money. She always said the same thing. “Good morning, I’m collecting for a church charity. Please give generously. We need $5,000.” Then she held out a collecting box. Most people put a few coins in the box. An artist lived in one of the apartments. He opened the door. “Good morning.” she said. “I’m collecting for a church charity. Please give generously. We need $5,000.” The artist thought for a moment, then he said, “I’m sorry, but I don’t have any money. However, I’ll give you a painting. It’s worth $ 400.” The woman thanked the artist and took the painting away. A week later she called on him again. “I’m sorry to trouble you again,” she said, “but we still need more money. I need another $ 100. Can you help?” “Of course,” the artist said. “I’ll increase the value of my painting to $ 500.”

小题1:Who was the woman collecting money for?

A.Poor children.

B.Herself.

C.Her friends.

D.A church.小题2:What did most people give her?

A.A lot of money.

B.A few dollars.

C.Paintings.

D.Very little money.小题3:Why didn’t the artist give money to her?

A.He was not a generous man.

B.He did not have any money.

C.He had too many paintings.

D.His paintings were worth a lot of money.小题4:Did the woman collect enough money at last?

A.No, she didn’t.

B.Yes, she did.

C.We don’t know.

D.Yes, she does.小题5:How much money does she need?

A.$5,000

B.$5,00

C.$4,00

D.We don’t know.

填空题