**2.5 Taq polymerase**

DNA polymerase allows replication. We use a DNA polymerase purified or cloned from of an extremophilic bacterium, *Thermus aquaticus*, which lives in hot springs and resists temperatures above 100°C. This polymerase (Taq polymerase) has the characteristic remarkable to withstand temperatures of around 100°C,

which are usually sufficient to denature most proteins. *Thermus aquaticus* finds its temperature of comfort at 72°C, optimum temperature for the activity of its polymerase [4].
