question : DNA polymerases have
a- 3' - 5' polymerase activity
b- 5' - 3' polymerase activity
c- 3' - 5' exonuclease activity
d- 5' - 3' exonuclease activity
e- endonuclease activity
answer : b , c , d are the answers .
DNA Polymerase 1 has both proof reading and excision repair activity , that is it has both 3' - 5' exonuclease activity and 5' - 3' exonuclease activity respectively. where as the DNA polymerase 2 and 3 have only proof reading activity and no excision repair activity, that is they have 3' - 5' exonuclease activity and no 5' - 3' exonuclease activity.
all the three DNA polymerases have only 5' -3' polymerase activity only.
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