Final answer:
DNA appears white and stringy when precipitated with ethanol. It aggregates and can be spooled on a glass rod. Upon rehydration in TE buffer, DNA dissolves slowly.
Step-by-step explanation:
During the process of ethanol precipitation, DNA appears as white and stringy material. As you add ice-cold ethanol to the supernatant containing the DNA, the DNA molecules aggregate and precipitate out of the solution. The precipitated DNA can then be spooled onto a glass rod due to its viscosity. It is normal for the DNA to not dissolve immediately upon the addition of the TE buffer; this is because DNA tends to rehydrate slowly.