What will happen to DNA if salt is added to it?
This makes the DNA less hydrophilic (less soluble in water). Ethanol has a lower dielectric constant than water so it&;s used to promote ionic bonds between the Na+ (from the salt) and the PO3- (from the DNA backbone) causing the DNA to precipitate.
Increase melting point (Tm)
Decrease Tm
Not affect Tm
Melting lead to denaturation of DNA
Metabolism of nucleic acids