Seeing DNA with the Naked Eye
It is possible to extract DNA from onions. Since rubbing alcohol is less dense than the mixture containing cellular debris, the alcohol floats on top. DNA is more attracted to alcohol than it is to the cell debris mixture and rose through it. The tiny bubbles that are attached to the DNA threads are air bubbles that come out of the liquid and cling to the rough surface of the DNA. These bubbles also help lift the DNA to the surface of the alcohol.
The tiny threads of the DNA are attracted to each other. After leaving the experiment for a few hours, some the DNA was clumped together floating on top of the alcohol. When some of the DNA threads were lifted out of the alcohol using the tines of a fort, the tines were covered with the DNA threads and looked like a spider web.
If some of the DNA threads that did not clump together are looked at through a magnifying glass, one can observe that the DNA threads had formed a twisted shape called a helix.