Question

Which of the following is true about Z-DNA helix?

(a) It has alternating GC sequences

(b) It is a permanent conformation of DNA

(c) It tends to be found at the 3’ end of the genes

(d) It has fewer base pairs per turn than B-DNA

The question was posed to me in an internship interview.

This intriguing question comes from Nucleic Acid Structure in section Nucleotides and Nucleic Acids of Biochemistry

Answer 1

The correct choice is (a) It has alternating GC sequences

The best I can explain: It is a temporary conformation of DNA

It has more base pairs per turn than B-DNA.