A) 10
B) 11
C) 12
D) 13
Correct Answer: C
Solution :
In Z-DNA or left handed DNA, the number of base pairs per helical turn is 12: It was first discovered by Alexander Rich (1980). The coiling follows a zig-zag course. It is having a zig-zag back bone and is left handed. It occurs in certain regions of chromosomes and is involved in regulating certain eukaryotic genes by blocking their activity.
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