问题 填空题 案例分析题

根据有关蛋白质的资料,回答问题:

胰岛素分子是一种蛋白质分子,现有如下材料:

①胰岛素含有2条多肽链,A链含有21个氨基酸,B链含有30个氨基酸,2条多肽链间通过2个二硫键(二硫键是由2个“­SH”连接而成的)连接,在A链上也形成1个二硫键,图示为结晶牛胰岛素的平面结构示意图:

②不同动物的胰岛素的氨基酸组成是有区别的,现把人和其他动物的胰岛素的氨基酸组成比较如下:

猪:B链第30位氨基酸和人不同;

马:B链第30位氨基酸和A链第9位氨基酸与人不同;

牛:A链第8、10位氨基酸与人不同;

羊:A链第8、9、10位氨基酸与人不同;

天竺鼠:A链有8个氨基酸与人不同,B链有10个氨基酸与人不同。

蛋白质是婴幼儿必须的大量营养物质,但是市场上劣质奶粉流行:劣质奶粉中含有大量还原糖,如果用斐林试剂鉴定,则该试剂与待测样液在试管中混合均匀后,还必须经过()处理,预计试管中混合液的颜色变化是()

答案

参考答案:水浴加热(或在50—65℃温水中加热约2min);由浅蓝色变为砖红色(或生成砖红色沉淀)

判断题
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Loma just had to get in touch with someone:“I had to tell my best friend something important. I tried calling her but I couldn’t get through. So I sent her an e-mail and then I spoke to her on MSN. Without technology I would not have been able to tell her. ”

Staying connected with friends and family is important for us. That’s why we asked our readers to tell us how cell-phones, e-mail, blogs, text messaging, and personal pages help them keep in touch. More than 1,500 responded.

Most of them told us they couldn’t live without technology:80%of teens said they need technology to stay in touch. Almost 30%said they’d be completely out of their friends without their cell-phones and other methods of communication.

What do they do when they’ve got news they need to share now? Most teens say they try to reach their friends by phone. But if they don’t reach them, they use QQ, e-mails, and text messaging to get the words out.

Lots of people use one way of communication—like text messaging—to get a friend’s attention and then use another where they can talk more. “My friends and I always tell each other everything that happens. So I send them text messages to tell them to come online so we can talk about it,” said Sabeiha.

“When planning to get together with friends”, Julian said, “the easiest and fastest way I know is to send a text message to my contact group.”Jocelyn said. “If I want to go to see a movie with a few friends, I usually send text message to them. By telephone, you have to call every single friend one by one. But text messaging allows you to send the same message to as many as you’d like, which saves a lot of time. ”

小题1: Which of the following is NOT mentioned in the passage?

A.E-mails.

B.Blogs.

C.Personal pages.

D.Personal letters.小题2:What do most young people use first when they have news to tell their friends?

A.MSN.

B.QQ.

C.Phones.

D.Text message.小题3: The underlined part “get the words out” means“     ”.

A.send the message

B.send the e-mail

C.talk with their friends

D.meet their friends小题4: In which part of a newspaper can you find this passage?

A.Sport.

B.Education.

C.Technology.

D.Culture.