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A primer is short oligo made from nucleic acids. It is the starting point for DNA polymerases to start DNA synthesis. DNA polymerases can only synthesize enlarge existing nucleic but not generate new ones 'de novo'. Primers can be made of DNA (for PCR) or RNA (naturally occuring).

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If we add only 1 primer in PCR

Using 1 primer will results in amplifying the original sequence in each cycle in a linear fashion: the primer will guide a single run of the polymerase. … You right that with one primer, the amplification is neglectable, almost invisible. …
Dror Hilman's user avatar