DNA polymerase is the enzyme that catalyzes the base pairing during DNA replication.
The DNA polymerases are enzymes that synthesize DNA molecules by assembling deoxyribonucleotides, the building blocks of DNA. These enzymes are essential to DNA replication when they read the existing DNA strand to synthesize new strand that match the existing ones by adding nucleotides to the three prime (3')-end of a DNA strand.
A change in protein comes along.
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They are examples of precipitation