问题 选择题

某同学在做“酿制酒酿”实验的过程中,对一些现象进行了解释。你认为下列解释不正确的是

A.用冷开水冲洗煮熟的糯米,可避免温度过高烫死酵母菌

B.甜酒曲中的微生物主要是酵母菌

C.把做好的材料放在温度25~30℃下保温,是因为这是发酵过程中酶最适宜的温度

D.用显微镜观察酵母菌时,不染色不影响观察

答案

答案:D

题目分析:制作酒时要用到酵母菌,酵母菌在无氧时能分解有机物产生酒精和二氧化碳。然后用水将糯米浸泡一昼夜,淘洗干净将糯米倒入蒸锅煮熟;蒸熟之后,用凉开水将糯米饭冲淋一次,冷却到30℃,30℃是酵母菌生活的适宜温度;降到适宜的温度,利于微生物的生活,A正确。在制作酒时,首先要把容器清洗干净,除去杂菌,避免杂菌的污染的;酒曲中的菌种主要是酵母菌,酵母菌发酵分解有机物能产生酒,B正确。最后置入25℃左右的环境中即可.温度适宜,利于微生物的生长和繁殖.着将酒曲粉末与糯米饭拌匀使之充分混合,将糯米饭压实后挖个小坑,淋上一些凉开水,最后将糯米饭放入容器中盖好,C正确。用显微镜观察酵母菌时,必须染色,否则影响观察,D错误。

单项选择题
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                                                                 SELF STUDY TIPS

     However difficult you find it to arrange your time, it will pay off in the long run if you set aside a

certain part of the day for studying-and stick to it. __1__ But don't forget to make sure that you

have enough left for recreational activities or simply to be "with" yourself: reading a novel or watching

a television programme.

     As part of your weekly schedule, it is also advisable to consider exactly what you have to do in that

week, and make sure that you handle the most significant tasks first. __2__

     On a physical level, make sure you have an area or space for studying. __3__ If you always study

in the same place, preferably a room of your own, you will find it easier to adjust mentally to the activity

when you enter that area. You should have everything that you might need at hand.

     Make sure that all the physical equipment that you use, such as a desk, chair etc. is at good height

for you. If you use a personal computer, there are plenty of guidelines available from the movement on

angles, lighting and the like.   __4__

     If you are working on topic your teacher has set, but finding it hard to concentrate, it may be that you

actually need to take your mind right off it for a period of time.  __5__ After a period away from the

test, having not thought about it at all, you may return to it refreshed and full of ideas.

A. It's wise to leave the easier or less urgent areas of your work until later.

B. It's all too easy to read something and then forget where it came from.

C. Consult these and avoid the typical student aches and pains.

D. "Airing the mind" can work wonders sometimes.

E. Make use of equipment that is available to you.

F. It is best to make a weekly schedule.

G. Don't do it just anywhere.