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Which of this subunit is not a part of core DNA polymerase?

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Which of this subunit is not a part of core DNA polymerase?

(a) Alpha

(b) Beta

(c) Theta

(d) Eta

I have been asked this question at a job interview.

Query is from DNA Replication Prokaryotes in portion DNA Replication of Cytogenetics

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Best answer
Right choice is (b) Beta

Explanation: Beta is the clamp which helps to provide polymerase with higher processivity, however even in its absence DNA replication will take place although processivity of polymerase would be slow. Alpha is the centre for polymerase activity and it along with theta and eta forms the core polymerase.

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