蛋白质能与双缩脲试剂发生作用产生紫色反应的原因是：蛋白质中有_爱下问搜题

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问题选择题

蛋白质能与双缩脲试剂发生作用产生紫色反应的原因是：蛋白质中有肽键，而肽键可以与双缩脲试剂发生反应产生紫色的络合物。那么下列可以与双缩脲试剂发生紫色反应的化合物是[ ]

A．

B．

C．

D．CH₃―CH₂OH

答案

A

阅读理解

Below is a discussion on a website.

http : //www.TalkingPoints.com
Stuck on a desert island?
Started on 23rd April by Steve Posts 1 -7 of 42
Post 1 Steve USA	Hi,everyone. What would you miss most and least if you were stuck on a desert island? For me, it would be the changing seasons in New England. I guess this will sound stupid but I'd probahly miss the rain. too. I wouldn't miss getting up at six every day to go to work,though ! What about you?
Post 2 Tomas Germany	Good question, Steve. I think I'd miss different types of bread, and shopping at the supermarket. I'd miss the food most. What would I miss least? My mobile phone-l'd like to be completely quiet-at least for a little while.
Post 3 Paola Italy	I would miss the company of people because I know I'd like to have someone to share experiences with. I'd go mad on my own. And I sure wouldn't miss junk mail (垃圾邮件 ) -I hate coming home every evening and finding a pile of junk mail in my post box.
Post 4 Miko Japan	Hi, I would miss Manga cartoon. the Internet and Japanese food, like sushi. I'd also miss Tv shows and shopping for clothes…
Post 5 Roger UK	I would miss my daily newspaper and listening to the news on Tv and radio. I'd feel very cut off if I didn't know what was happening in the world.What l'd miss least would be traffic jams in the city, particularly my journey to work.
Post 6 Jayne Canada	Why hasn't anyone mentioned their family? l'd be lost without my husband and two kids.They're the most important for me. And I can't get started in the morning without a cup of black coffee. I wouldn't miss doing the housework !
Post 7 Jaime Mexico	It would have to be music. I couldn't live without my nlusic. I wouldn't miss going to school at all or doing homework!

1. Who would miss his or her family most?

A. Jaime.
B. Jayne.
C. Miko.
D. Paola.

2. Which of the following people would feel most uncomfortable without the news media?

A. Steve.
B. Jaime.
C. Roger.
D. Tomas.

3. How many of them mentioned that they would miss food or drink?

A. One.
B. Two.
C. Three.
D. Four.

单项选择题

中型压缩机的排气量范围是（）。

A．1m³/min＜y≤100m³/min

B．1m³/min＜y≤10m³/mia

C．10m³/min＜y≤100m³/mln

D．50m³/min＜y≤100m³/min