This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General physiology, Subject name: Physiology
For PCR which of the following is not required 
Select and explain. 
A. Taq polymerase, B. d-NTP, C. Primer, D. Radiolabelled DNA probe
D: Radiolabelled DNA probe
Answer: D: Radiolabelled DNA probe 
Explanation: Taq polymerase: It is a heat stable enzyme used in polymerase chain reaction Primer: it is a small sequence of 20 t0 30 base pairs used in PCR dNTP s : they are deoxy nucleoside triphosphates which help in DNA synthesis Ref: Guyton and Hall textbook of medical physiology 12th edition, chapter : 20