Add a small amount of detergent to a test tube (about 0.25 mL). Put a glove on the hand you will use to hold your test tube not the hand you will use to pour. Now carefully pour the drink containing your cheek cells into the test tube with detergent until the tube is half full.
To get the DNA out of your cheek cells you need to break open both the cell membranes and the nuclear membranes. Cell membranes and nuclear membranes consist primarily of lipids Dish washing detergent like all soaps, breaks up lipids. This is why you use detergents to remove fats from dirty dishes. Adding the detergent to you cheek cell solution will break open the cell membranes and nuclear membranes and release your DNA into the solution
To get the DNA out of your cheek cells you need to break open both the cell membranes and the nuclear membranes. Cell membranes and nuclear membranes consist primarily of lipids Dish washing detergent like all soaps, breaks up lipids. This is why you use detergents to remove fats from dirty dishes. Adding the detergent to you cheek cell solution will break open the cell membranes and nuclear membranes and release your DNA into the solution