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问题 多项选择题

下列说法正确的是()

A．标记反应时，活化生物素与待标记抗原或抗体应有适当比例

B．一般每个抗原或抗体分子标记1～3或3～5个生物素分子较为适宜

C．生物素与抗原、抗体等蛋白质结合后，不影响后者的免疫活性

D．生物素与酶结合后，酶活性不受影响

E．为减少空间位阻影响，常在生物素与被标记物间加λ交联臂样结构

答案

参考答案：A, B, C, E

填空题
用所给单词和短语的适当形式填空。
be named after,    up-to-date,    creature,    get close to,    minority,
various,    admission,    profit,    a variety of,    pull into
1. There are ____ ways of getting to the station but I preferred to walk there.
2. The ____ to the movie was five dollars.
3. This new invention will bring you great ____ like a goldmine.
4. This is the school that ____ a hero where he spent his childhood.
5. On the outskirts of the city, we saw many ____ bungalows (平房).
6. Coral is not a plant but animal life of ____ different shapes and bright colours.
7. Our train ____ Beijing Station on time.
8. Just imagine how horrible the world would be if' human is the only ____ in the world.
9. Take a camera and ____ the nature in your summer holiday.
10. We're in the ____ more people are against us than with us.
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问答题

* * 散功效与作用
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