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Q. Diameter of DNA is about:

NTA AbhyasNTA Abhyas 2020

Solution:

The diameter of DNA is about $20$ Armstrong. Watson and Crick model of the double helix is a right-handed coiled DNA. The two strands are antiparallel and complementary to each other. Both strands of the DNA helix are joined by hydrogen bonds. The coiling of two strands creates major and minor grooves.