Question

what is the purpose of the rubbing alcohol?

its less dense and allows the dna to float up

it helps make it easier to see the dna extraction

it clumps up the dna

rewatch

Explanation:

Rubbing alcohol (ethanol or isopropanol) is less dense than water - based solutions used in DNA extraction. DNA is insoluble in alcohol. When alcohol is added, DNA precipitates (clumps up) because it moves out of the aqueous (water - based) solution where it was dissolved. This clumping makes the DNA visible as a white, stringy substance, facilitating its extraction and collection.

Answer:

It clumps up the DNA