Multiple choice Which of the following enzymes is primarily used in PCR? Gyrase Transcriptase Hexokinse Taq polymerase Reverse transcriptase Reveal answer Fill a bubble to check yourself D Correct answer Explanation It is a thermostable DNA polymerase named after the thermophilic bacterium Thermus aquaticus. It is the enzyme most widely used in the Polymerase Chain Reaction (PCR).