Practice question

Hot Start PCR is a modification aimed at enhancing specificity by controlling polymerase activity until stringent conditions are achieved. Conventional Taq can extend nonspecifically at ambient temperature during reaction assembly, generating primer-dimers and off-target products. In Hot Start, enzyme is provided in inactive state through antibody binding, chemical modification or wax barrier. Activation requires initial high-temperature incubation at 94-95°C, which denatures inhibitors and releases functional polymerase. This ensures synthesis begins only at temperatures that disfavor nonspecific annealing. It does not involve low-temperature performance, random primers or circular template amplification, but specifically temperature-dependent activation.