What's the difference between the effect of alcohol in the test of fat in biological tissue and the observation of mitosis in plant cells~
The former: wash floating color, avoid excessive dye influence observation
The latter: dissociation, the main purpose is to separate the cells, easy to disperse in the later operation, but also kill the cells
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- 1. Put the leaves of plants in alcohol to heat. What is the function of alcohol? Photosynthesis experiment Understand the answer I did not give, not to
- 2. In senior high school biology experiment, alcohol and hydrochloric acid play an important role in the whole process,
- 3. What's the effect of alcohol? Which experiment
- 4. Dosage and usage of hydrochloric acid and alcohol in high school biology experiment The name of the experiment should be specified For example, 8% hydrochloric acid is used to observe the distribution of DNA and RNA, and change the permeability of cell membrane Ask for specific and complete answers
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- 7. 500ml 95% alcohol, how much water to make 75% alcohol?
- 8. How much water does 1000 grams of 90% alcohol need to be diluted to 50%?
- 9. To dilute 600 ml of 95% alcohol into 75% disinfectant alcohol, how many ml of distilled water should be added?
- 10. What is the meaning of the chemical formula of alcohol 1. Represents an alcohol molecule 2. Alcohol is a substance 3. Alcohol is composed of hydrogen, carbon and oxygen 4. It means that an alcohol molecule contains two carbon atoms, two oxygen atoms and two hydrogen atoms
- 11. The following is about the application of alcohol in biological experiments A. In the experiment of using Sudan III to identify fat, the role of alcohol is to wash off the floating color on the experimental materials. B. absolute alcohol plays the role of separating pigment in the experiment of pigment extraction and separation. C. when making onion root tip cell mitotic chip, the components of dissociation solution are hydrochloric acid and alcohol D In the experiment of observing the distribution of DNA and RNA in cells, alcohol can be used to change the permeability of cell membrane and accelerate the dye entering into cells
- 12. The purpose of each concentration of alcohol,
- 13. High school biological reagents, such as alcohol, say different concentrations in their respective experiments, 3Q ~!
- 14. How to make 75% ethanol from 95% ethanol
- 15. Now there is 98% ethanol, how to prepare 75% ethanol
- 16. Who knows how 75% alcohol becomes anhydrous ethanol? Why?
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