Question

how does alcohol help in the dna extraction process? it separates the dna and makes it clump together. it separates the dna and then dissolves it. it dissolves the dna and changes its color. it breaks down the cell membranes to release the dna.

Explanation:

In DNA extraction, alcohol (usually cold ethanol or isopropanol) is added after the DNA has been released from the cells. DNA is insoluble in alcohol. When alcohol is added, it causes the DNA to precipitate out of the solution. This precipitation makes the DNA clump together, allowing it to be separated from the rest of the cellular components (like proteins, salts, etc.) in the solution.

• Breaking down cell membranes is usually done by detergents (not alcohol).
• Alcohol does not dissolve DNA; it causes DNA to come out of solution (precipitate).
• Alcohol does not change the color of DNA.

Answer:

It separates the DNA and makes it clump together.