题目内容

Breakfast is the first 1______of the day. We have juice, toast with butter, eggs, and milk. We can also have cereal.We eat lunch 2______. Some people like to eat hamburgers and French fries. Others like tuna fish or egg salad sandwiches. Many 3______give children peanut butter and jelly sandwiches for lunch.In theUnitedStatesdinner is usually the biggest meal of the day. We usually eat dinner at 6:00 in the evening. A large dinner may be 4______soup, salad, meat or fish, vegetables, potatoes and dessert, and coffee, tea, or milk.It is important to eat three good meals a day. That way we can be 5______.

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维持蛋白质二级结构稳定的主要作用力是()。

A. 静电作用
B. 氢键
C. 疏水键
D. 范德华作用力

有一混合蛋白质溶液,已知其中所含蛋白质的pI分别为4.6, 5.0, 5.6 ,6.7和7.8。 电泳时欲使其中四种蛋白质向正极泳动,请问缓冲溶液的pH应该设定为( )。

A. 4.0
B. 5.0
C. 6.0
D. 7.0
E. 8.0

成人女性血红蛋白正常参考值范围是:

A. 100-140g/L
B. 110-150g/L
C. 120-160g/L
D. 140-170g/L
E. 170-200g/L

缺铁性贫血最主要是缺:

A. 贮存铁
B. 血清铁
C. 蛋白质
D. 甲状腺素
E. 钴

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