Question

Mention atleast two topologiCal features of DNA

Answer 1

Answer:

Topological properties of DNA are defined by: twist (Tw, the number of times each helix twists around the other) and writhe (Wr, the number of crossings the double helix makes around itself); in a covalently closed DNA molecule, the sum of these two parameters is a topological invariant, called linking number (Lk = Tw + Wr).

Linking number is a topological property of DNA. Linking number is a sum of twists and writhes. The numbers of time one strand of DNA turned around another strand is called a twist while inter-coiling of the double helix is termed as writhe.

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