1. The cell membrane: This is the outer layer of the cell that encloses the cytoplasm.
2. The nuclear membrane: This membrane surrounds the nucleus, which contains the cell's DNA.
Breaking down these membranes can be achieved through various methods, such as:
* Mechanical disruption: Using methods like grinding or homogenization to physically break the cell walls and membranes.
* Chemical lysis: Using detergents or enzymes to dissolve the membranes.
* Freezing and thawing: Repeated freezing and thawing cycles can disrupt the cell membranes.
Once the membranes are broken down, the DNA can be extracted using further purification techniques.
