问题
名词解释
蛋白质多态性
答案
参考答案：指一种蛋白质存在多种不同的变型，这些变型的产生是由于同一基因位点内的突变，产生复等位基因，导致合成不同类型的蛋白质。
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蛋白质多态性
参考答案：指一种蛋白质存在多种不同的变型，这些变型的产生是由于同一基因位点内的突变，产生复等位基因，导致合成不同类型的蛋白质。
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| Last summer I was a volunteer at a shelter for the homeless, a place for homeless people to sleep at night. I wasn't working that summer and was __1__ only two classes in summer school, so I had some free time. Three nights a week, I __2__ in the kitchen of the shelter along with four other volunteers. We planned and __3__ for 45 people hot meals with vegetables, chicken, fish and fruit. The homeless people __4__ this good food because many of them usually didn't eat well. I __5__ this volunteer work, making __6__ with the four volunteers in the kitchen. One was a very nice elderly housewife, one a movie actor, another a young teacher, and the other a college student, like me. I talked to a lot of the homeless people at the shelter. Their life stories __7__ me with sympathy. Some of them had __8__ with alcohol or drugs while others only had bad __9__. One woman worked for almost 30 years for a small company, and then she lost her job. She wanted to look for a __10__ job, but couldn't find one, for she was too __11__. She could do nothing but sell her furniture-sofas, chairs, and tables so that she could pay for her food. The woman __12__ on job hunting, but she __13__ couldn't find one. She had no money for her __14__ and had to sleep in her car. Then she had to sell her car. Alone, __15__, and homeless, she finally came to the shelter. | ||||
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