Question

The characteristic feature of Z-DNA is

• A. Left handed
• B. Right handed
• C. 12 base pairs in each turn
• D. Both A and C

Answer 1

The correct option is D Both A and C

DNA duplex of Watson and Crick is right handed and is called as B-DNA. Z-DNA is left handed double helix, which contains zigzag backbone of phosphodiester bonds and 12 base pairs per turn. The diameter of Z-DNA is 18 $\mathring{A}$ as against B-DNA diameter of 20 $\mathring{A}$.
So, the correct answer is option D.