问题
单项选择题
结合酶中，与酶蛋白结合紧密，不易从酶蛋白上脱落下来的是（）。
A．糖类
B．辅酶
C．辅基
D．金属离子
E．维生素
答案
参考答案：C
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结合酶中，与酶蛋白结合紧密，不易从酶蛋白上脱落下来的是（）。
A．糖类
B．辅酶
C．辅基
D．金属离子
E．维生素
参考答案：C
| 完形填空 My mother used to ask me what was the most important part of the body. Through the years I would __1__what I thought was the correct answer. When I was younger, I thought __2__was very important to us as humans, so I said, "My ears, Mommy". She said, "No. Many people are __3__. But you keep thinking about it and I will ask you again soon." Several years passed __4__she asked me again. Since making my first __5__, I had often thought of the correct answer. So this time I told her, "Mommy, sight is very important to everybody, so it must be our eyes." She looked at me and told me, "You are __6__fast, but the answer is not correct because there are many people who are blind." __7__the years, Mother asked me a couple more __8__and always her answer was, "No, but you are getting __9__every year, my child." Then last year, my Grandpa died. Everybody was crying when it was our __10__to say our final good-bye to Grandpa. Mom asked me, "Do you know the most important body part yet, my dear?" I was __11__when she asked me this now. I always thought this was a __12__between her and me. She saw the__13__on my face and told me, "This question is very important. It shows that you have really __14__your life." I saw her eyes well up with tears. She said, "My dear, the most important body part is your __15__." I asked, "Is it because it holds up your head?" She replied, "No, it is __16__on them a crying friend or loved one can rest their head. I only hope that you have enough __17__and friends that you will have a shoulder to cry __18__when you need it." Then and there I knew the most important body part is not a __19__one. It is sympathetic to the pain of __20__. | ||||
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