Question

The DNA polymerase needed for PCR is obtained from an organism called _______.

• A. E.coli
• B. Thermus aquaticus
• C. Saccharomyces cerevisiae
• D. S. aureus

Answer 1

The correct option is B Thermus aquaticus

Thermus aquaticus is an archaebacteria that can survive in high temperatures. Due to this, their enzymes are capable of working in unusually high temperature and perfectly suitable for PCR since it employs temperatures as high as ${96}^{\circ }C$. At this high temperature, most enzymes occurring in nature get denatured. Taq polymerase however has heat resistant capabilities.