Why is sample homogenization done in DNA isolation?

Correct answer: To break the sample uniformly

The governing concept is physical disruption before chemical lysis. Homogenization breaks a tissue or solid sample into smaller, more uniform particles and increases the surface area exposed to the lysis buffer. As a result, detergents, salts, and protective reagents can contact more cells efficiently, improving the release and recovery of DNA. Therefore option A is correct. Homogenization does not stain DNA, manufacture ethanol, or add smell to proteins, so options B, C, and D are unrelated. It should be performed carefully: excessive grinding can produce heat or shear DNA, while insufficient disruption may leave intact tissue and reduce yield. The exact tool depends on the sample type.