抗生素作为治疗细菌感染的药物,其高效性和巨大的经济价值使抗生素工业经久不衰。其中

题型:填空题

问题:

抗生素作为治疗细菌感染的药物,其高效性和巨大的经济价值使抗生素工业经久不衰。其中青霉素的发现和应用具有划时代的意义。

(1)青霉菌发酵产生青霉素。青霉菌的新陈代谢类型是_________,青霉素是青霉菌的________代谢产物。

(2)在生产和科研中,常选用处于_________期的青霉菌作为菌种或研究材料,因为此时的青霉菌代谢旺盛,__________和__________比较稳定。

(3)对青霉菌菌体生长情况的测定:取一定体积的发酵液,经离心分离、反复洗涤后,__________,再计算发酵罐中菌体的总重量。

考点:微生物发酵及其应用生物的新陈代谢
题型:填空题

So long as teachers fail to distinguish(differ) between teaching and learning, they will continue to undertake to do for children that which only children can do for themselves. Teaching children to read is not passing reading on to them. It is certainly not endless hours spent in activities about reading. Douglas insists that "reading cannot be taught directly and schools should stop trying to do the impossible".

Teaching and learning are two entirely different processes. They differ in kind and function. The function of teaching is to create the conditions and the climate that will make it possible for children to plan cleverly the most efficient system for teaching themselves to read. Teaching is also a public activity. It can be seen and observed.

Learning to read involves all that each individual does to understand the world of printed language. Almost all of it is private, for learning is an occupation of the mind, and that process is not open to public scrutiny.

If teacher and learner roles are not interchangeable, what then can be done through teaching that will aid the child in the long search for knowledge Smith has one principle rule for all teaching instructions. "Make learning to read easy, which means making reading a meaningful, enjoyable and frequent experience for children. "

When the roles of teacher and learner are seen for what they are, and when both teacher and learner fulfill them properly, then much of the pressure and feeling of failure for both is got rid of. Learning to read is made easier when teachers create an environment where children are given the chance to solve the problem of learning to read by learning.

The teaching of reading will be successful if ().

A. teachers can make their teaching activities observable

B. teachers can teach their students how to read

C. teachers can improve conditions at school for the students

D. teachers can enable students to develop their own way of reading

题型:填空题

漫画“整齐划一的舞蹈很美,思想却未必”启示我们

[ ]

①舞蹈与思想各有其特殊性②人们的思想是不可能完全一致的③要反对思想僵化,培养创新精神④要追求舞蹈形式与思想内容的统一

A.①②  

B.③④  

C.①③  

D.②④

题型:填空题

下列生活中的做法不正确的是(  )

A.洗衣服的水用来冲厕所

B.用活性炭除去冰箱中的异味

C.餐具上的油污用洗洁精洗涤

D.霉变花生清洗后直接食用

题型:填空题

关于酶的最适pH叙述正确的是

A.酶最稳定时的pH

B.酶促反应速度最大时的pH

C.酶的特征性常数

D.pH值为中性

E.酶的等电点

题型:填空题

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