A) If both the assertion and the reason are true and the reason is a correct explanation of the assertion
B) If both the assertion and reason are true but the reason is not a correct explanation of the assertion
C) If the assertion is true but the reason is false
D) If both the assertion and reason are false
E) If the assertion is false but reason is true
Correct Answer: B
Solution :
Z-DNA is left-handed double helix with zig-zag back-bone, alternate purine and pyrimidine bases, single turn of 45 Å length with 12 base pairs and a single groove. Due to a different arrangement of molecules within Z-DNA polymer, phosphate backbone follows a zig-zag course, while in B-DNA it is regular. In Z-DNA, sugar residues have alternating orientation so that the repeating unit is a dinucleotide against B-DNA where repeating unit is a mononucleotide and the orientation of sugar molecules is not alternating.
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