question archive PCR stands for polymerase chain reaction

PCR stands for polymerase chain reaction

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PCR stands for polymerase chain reaction. If you break that down, it helps to understand what it is.

"Polymerase" literally means an enzyme that builds large molecules (like DNA) "Chain reaction" means a series of chemical reactions. So, PCR is a series of reactions used to build large molecules (specifically DNA). Essentially, it's like a copy machine for DNA. We can take small amounts of DNA and make millions of identical copies--for example, this is how a tiny blood droplet at a crime scene can be used to identify a person that was present.

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