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  4. The helix of z-DNA is :

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Q. The helix of z-DNA is :

Haryana PMTHaryana PMT 2002

Solution:

The DNA duplex of Watson and Crick is right handed helix and is called the B-DNA. There are five more models (A-DNA, C-DNA, D-DNA, E-DNA and Z-DNA) have been proposed. The Z-DNA is left handed double helix which contains zigzag back and 12 base pairs per turn.