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Question:

The source of Taq polymerase used in PCR is a Thermophilic bacterium, Halophilic bacterium, Mesophilic fungus, or Thermophilic fungus?

Mesophilic fungus

Halophilic bacterium

Thermophilic fungus

Thermophilic bacterium

Solution:

The correct option is D. Thermophilic bacterium.
Taq polymerase used in PCR is obtained from thermophilic bacteria, Thermus aquaticus. This bacteria can survive at extremely high temperatures. So, the correct answer is option D.