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  4. The diameter of Z-DNA is

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Q. The diameter of Z-DNA is

Bihar CECEBihar CECE 2007

Solution:

Z-DNA is left-handed double-helix with zig-zag back bone. The helix of Z-DNA is 18 $ \overset{o}{\mathop{A}}\, $ in diameter containing 12 bp per turn. One turn of Z-DNA has 45 $ \overset{o}{\mathop{A}}\, $ length. B-DNA is right-handed double-helix. The helix of B-DNA is 20 $ \overset{o}{\mathop{A}}\, $ in diameter containing 10 bp per turn. One turn of B-DNA has 34 $ \overset{o}{\mathop{A}}\, $ length.