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Which of the following ensures the stability of the helical structure of a DNA?

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in Biology – Class 12 by (271k points)
Which of the following ensures the stability of the helical structure of a DNA?

(a) Presence of repetitive structures of a DNA code

(b) Stacking of one base pair over the other

(c) Presence of aneuploidy

(d) Occurrence of chromosomal rearrangements

I had been asked this question during an interview.

The question is from Structure of a Polynucleotide Chain topic in division Molecular Basis of Inheritance of Biology – Class 12

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Right option is (b) Stacking of one base pair over the other

To explain I would say: When one base pair is stacked over the other in a helical fashion, the DNA will be stable. A right-handed curving fashion is seen in the DNA. When repeating structures are present, the DNA will not be stable. Aneuploidy is in relevance to the abnormality in the number of chromosomes. When chromosomal rearrangements occur, deletion, duplication, translocations and inversions may occur. There will not be any stability.

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