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When was DNA polymerase III discovered as the major enzyme behind DNA replication in bacteria?

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When was DNA polymerase III discovered as the major enzyme behind DNA replication in bacteria?

(a) 1949

(b) 1959

(c) 1969

(d) 1989

This question was posed to me in an interview.

I'm obligated to ask this question of DNA Replication topic in division DNA Replication and Repair, Cellular Reproduction of Cell Biology

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Right option is (c) 1969

Best explanation: In 1960s, there were hints that Kornberg enzyme – DNA polymerase I was not the only polymerase in a bacterial cell. In 1969, it came to be known that the major enzyme behind DNA replication is DNA polymerase III.

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