DNA has different conformations, they are called
Type A DNA has the shortest and thickest shape, and it takes 11 base pairs to complete one turn of the helix; whereas in type B DNA it takes 10 base pairs to complete one turn of the helix, in addition, the double helix is longer and thinner. The Z-DNA form presents its rotation direction to the left.
With this information, we can conclude that there are three different types of DNA.
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