问题 问答题 简答题

简述粮油原料中蛋白质的种类与特点?

答案

参考答案:

①清蛋白:溶于纯水和中性盐的稀溶液,加热即凝固。

②球蛋白:不溶于水,溶于中性盐的稀溶液。

③胶蛋白:又称醇溶谷蛋白,不溶于水与中性盐,而溶于70%~80%的乙醇溶液。

④谷蛋白:不溶于水和中性盐的稀溶液,也不溶于乙醇溶液,而溶于稀酸或稀碱溶液,是某些植物种子中的储藏性蛋白质,禾谷类粮食中都有。

完形填空

Peter and James were brothers. One afternoon ___1____ the lessons were over, they stayed in school to help their teacher. They___ 2__ for an hour. Then the teacher said, “Thank you, boys. We will finish the work tomorrow. Now you must go home.”

When the boys ___3_____ home, it was seven o’clock. There was light inside their house and the door was ____4____. They could see a man inside, too.

“Who can it be?” thought Peter. “Father and Mother have gone shopping. They won’t be home ____5____ eight o’clock.”

When the _____6____ man saw Peter, he smiled and said, “Come in! You don’t know me, but I’m your ______7______ friend. He  asked me to fetch (取)some money for him.” The man did not see James.

Peter went inside and began talking to the man but James did not. He quietly but quickly ran off to call the police. He soon found a policeman and _____8____ him back to their home. The man was still there, but when he saw the policeman, he tried to run off. The policeman _____9____ him and held his arm.

Just then Mr. and Mrs. Baker, the boys’ parents ______10______.

“No!” said Baker. “I don’t know him. He must be a thief. I am glad you have caught him.”

(   )1. A. if          B. when         C. before           D. until

(   )2. A. studied     B. worked        C. stayed           D. watched

(   )3. A. arrived in   B. went to        C. got to            D. reached

(   )4. A. open       B. opened        C. opening          D. close

(   )5. A. at          B. since         C. until             D. after

(   )6. A. away      B. out           C. outside           D. inside

(   )7. A. father       B. fathers        C. father’s          D. brother’s

(   )8. A. brought     B. bring          C. take             D. caught

(   )9. A. stoped      B. stopped        C. catch           D. saw

(   )10. A. returned    B. come          C. arrive           D. reached

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