because of the negative charge in alcohol and the dna. it makes the dna not stay together.
According to me, we use alcohol because DNA is insoluble in alcohol, it aggregates together, giving a pellet in centrifugal and we can see a precipitated DNA with naked eyes (that we suppose to see in experiment i.e DNA extraction)....
The actual role of phenol chloroform isoamyl alcohol in a plasmid DNA extraction is to purify the DNA. The alcohol will act in part as a detergent.
DNA is not soluble in isopropyl alcohol. It will precipitate out when you add this solvent. Once out of solution you can centrifuge it down and collect the pellet of DNA.
Alcohol does not kill brain cells.
Alcohol
Hmm, I think it's used to wash the DNA from the substance used for extracting the DNA, such as Isopropanol, CLS, NLS, PPS which are used in the process of extraction to the process to precipitate the DNA (using isopropanol). DNA is insoluable in alcohol. Actually the real reason for using alcohol in a DNA extraction is to "precipitate" (NOT RAIN) the DNA, as you may have realized when you did the experiment , the Alcohol step is the last step that brings the DNA to the surface. Finally alcohol can be added so that the DNA can be seen, but first it is crucial to know why the addition of alcohol is such an important step. This step is closely related to a process called precipitation, which is " the process of separating a substance from a solution as a solid" (answers.com, precipitation). Precipitation separates the DNA so that it can no longer remain dissolved and so that it can be seen. DNA is less dense than water and alcohol , so the DNA rises to the alcohol layer. Also the DNA is soluble in water and insoluble in alcohol, so when it is just in the mixture it is quite invisible but once the alcohol is added it condensates by precipitation to the point where it is very visible.
Alcohol does not kill pubic lice. They must be killed with insecticide.
Alcohol can kill you on the spot if you drink a huge amount of alcohol, drink grain alcohol in large amounts, or are allergic to alcohol. Allergies to alcohol can cause throat swelling and an inability to breathe.
70% ethnol is used for the dna isolation becuse it makes hydrogen bonding with the water molecules and makes DNA hydrophopic so that it pricipitated.
Because it is less dense than the alcohol and make it float
the washing buffers contain ethanol which precipitating DNA molecules and form clumps. DNA is insoluble in alcohol so come together in an alcohol buffer.