Muscles are made up of muscle cells, the skin is made up of skin cells, and so on.
To isolate plant DNA blend 50g of Cauliflower in 200 mL of water for 30 seconds to get single cells . Strain through muslin cloth. Pour 15 mL of liquid into a screw cap tube with 3 drops of detergent and shake gently for 5 seconds. Use a hooked glass rod to spool out strands of DNA at the interface. Save this for step 3 Swirl about 25 mls of water around your mouth for 30 seconds.