There are three types of dna polymerase 1,2 and 3 and out of these dna polymerse 2 is less active in dna repliaction but still there are 3 dna polymerase and the definition of dna polymerase is the main enzyme in dna replication  .... if all these statements are correct then there is a question in mcq of this topic that dna polymerse that helps in replication is of how many types then its answer would be 3 ... then how could the answer be 1 ???.....please clarify my doubt as soon as possible and please tell me if somewhere I'm wrong...

Asked by arshksaini04 | 19th Sep, 2015, 11:33: PM

Expert Answer:

The main function of DNA polymerase is to make DNA from nucleotides, the building blocks of DNA. All the DNA polymerases act in replication of DNA. But DNA polymerase II is involved in repair of damaged DNA which proofreads 3' to 5' exonuclease activity.It does not have any direct relation to replication.Similarly DNA polymerase I is also a repair polymerase has both 5' to 3' and 3' to 5' exonuclease proofreading activity.So, only DNA polymerase III is the primary enzyme involved in DNA replication.

Answered by Sivanand Patnaik | 20th Sep, 2015, 08:36: AM