Which of the following is/are essential feature(s) of high-fidelity DNA polymerases used in polymerase chain reaction?
a. 5'-3' exonuclease activity
b. Endonuclease activity
c. 3'-5' exonuclease activity
d. Optimum temperature for activity ≥72 ℃
1
a,b,d
2
a,c,d
3
c and d
4
b and d
5
Question Not Attempted