The polymerase chain reaction relies upon unusual, heat-resistant ________ that were isolated from bacteria living in hot springs.

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The polymerase chain reaction (PCR) relies upon DNA polymerases that are able to withstand high temperatures without breaking down. These heat-resistant DNA polymerases were isolated from bacteria living in hot springs, such as Taq polymerase from Thermus aquaticus. Restriction enzymes and plasmids are not directly involved in the PCR process, while DNA ligases are not used in the initial amplification step of PCR.

The Polymerase Chain Reaction Relies Upon Unusual, Heat-Resistant ________ That