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

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

A. In the experiment of using Sudan III to identify fat, the effect of 50% alcohol is to wash off the floating color, a is correct; B, absolute alcohol plays the role of extracting pigment in the experiment of pigment extraction and separation, B is wrong; C, the steps of making onion root tip cell mitosis chip are: dissociation, rinsing, staining and preparation, in which dissociation