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DNA Replication - Medical Science

Q1:

Which of the following statements on replication in E.coli is correct?

A It occurs in a unidirectional manner

B It occurs in bidirectional manner

C Always uses T7 DNA polymerase when infected by T7 phage

D Occurs only when λ phase has infected E. coli

ANS:B - It occurs in bidirectional manner

It is because the DNA is antiparallel. It can be synthesised both in 3'-5' direction and the 5'-3' direction by the DNA polymerase enzyme.