Polymerase chain reaction (PCR) uses Taq polymerase and spec…
Polymerase chain reaction (PCR) uses Taq polymerase and specifically-designed DNA primers in order to target and amplify a specific section of DNA out of a whole genome. This ultimately leads to exponentially more copies of the targeted stretch of DNA than you started with. Key to PCR are 3 steps that are repeated dozens of times in a cycle, roughly doubling the amount of targeted DNA with each cycle. In what order do these 3 steps occur, starting with the step that begins the 1st PCR cycle?