Question: A closed circular duplex DNA has a 100-bp segment of alternating C and G residues. On transfer to a high salt solution, the segment undergoes

A closed circular duplex DNA has a 100-bp segment of alternating C and G residues. On transfer to a high salt solution, the segment undergoes a transition from the B conformation to the Z conformation. What is the change in its linking number, writhing number, and twist?

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