菊糖加25％α-萘酚的乙醇溶液，再加硫酸，显______________，并很快溶解。

Fill in the blanks with appropriate coordinator or subordinator:______________ a well-balanced diet ___________ adequate sleep is needed for good health

Many boys enjoy _______ football, basketball or baseball

Which do you think is ________, health or wealth？

_______________will not continue if an ongoing operation is changed or deletedA、

渗出液的特点：蛋白质含量________、细胞成分________，因此比重________、________凝固。

29．__________ when you are on the bus or bike．

Which do you think is _________________important, health or wealth?

And they can ______their passports______，making leaving or “escaping” virtually impossible.

蛋白质属_____________，在碱性溶液中带______，在酸性溶液中带______。

Duty is an act or a course of action that people __________you to take by social customs, law or religion.

红细胞含有大量血红蛋白，红细胞的机能主要是由血红蛋白完成，血红蛋白的主要功能是携带O2或CO2，我们可以选用猪、牛、羊或其他脊椎动物的血液进行实验，来提取和分离血红蛋白。请回答下列有关问题：(1)血红蛋白的提取和分离一般可分为四步：_________、_________、_________和_________。(2)实验前取新鲜的血液，要切记在采血容器中预先加入柠檬酸钠，取血回来，马上进行离心，收集血红蛋白溶液。①加入柠檬酸钠的目的是______________________________。②以上所述的过程即是样品处理，它包括___________、___________、___________透析。(3)收集的血红蛋白溶液在透析袋中可以经过透析，这就是样品的粗分离。①透析的目的_________________________________。②透析的原理是_________________________________。(4)然后通过凝胶色谱法将样品进一步纯化，最后经SDS-聚丙烯酰胺凝胶电泳进行纯度鉴定。样品纯化的目的是_________________________________。