What will happen to DNA if salt is added to it?
Correct Answer: Increase melting point (Tm)
Description: 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.
Category:
Biochemistry
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