Which of the following secondary structures is correctly identified?
A)Z-DNA: left-handed DNA with pyrimidines in the syn conformation and purines in the anti conformation
B)hairpin structure: self-complimentary single stranded molecules that form a parallel helix
C)cruciform: a double hairpin formed in a region of palindromic DNA
D)H-DNA: triple helical structure that results when Watson-Crick base pairing does not form and instead, Hoogsteen base pairing occurs
E)none of the above

Question

Quizplus · Accepted Answer

The cruciform structure is a double hairpin formed in a region of palindromic DNA, where the two complementary strands of DNA hydrogen bond with each other to form a cross-shaped structure. Z-DNA has a left-handed helix and pyrimidines in the anti-conformation and purines in the syn-conformation. Hairpin structures are self-complimentary single stranded molecules that form a loop structure, not a parallel helix. H-DNA is a triple helical structure that results from the formation of Hoogsteen base pairing in regions of DNA where Watson-Crick base pairing cannot occur.

Which of the Following Secondary Structures Is Correctly Identified