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DNA topoisomerase I of E. coli catalyses 

(A) Relaxation of negatively supercoiled DNA 

(B) Relaxation of positively supercoiled DNA 

(C) Conversion of negatively supercoiled DNA into positively supercoiled DNA 

(D) Conversion of double helix into supercoiled DNA

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(A) Relaxation of negatively supercoiled DNA

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