Multiple choice

There are different types of DNA on the basis of their bases per turn, helical diameter, handedness of the turn of the helix, etc. These are A-DNA, B-DNA, C-DNA, D-DNA and Z-DNA found in the chromatin.

Only one type of DNA has left handedness turn of their helix. Name the DNA.

  1. Z-DNA

  2. B-DNA

  3. C-DNA

  4. D-DNA

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A Correct answer
Explanation

Z-DNA: Only Z-DNA has left hand turn and having a helical diameter of 18 Angstrom. B-DNA has  righthanded turn and helical diameter of 20 Angstrom. C-DNA has righthanded turn and helical diameter of 19 Angstrom. D-DNA has righthanded turn.