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Molecular Basis Of Inheritance

Question
CBSEENBI12000301

Why is the DNA molecule compared to a spiralling staircase ?

Solution
DNA molecule is “Double helical” structure. It is formed of two unbranched polynucleotide complementary strands. The two strands are spirally coiled around a central axis. The nitrogen bases are paired similar to horizontal steps of ladder whereas sugar and phosphate looks similar to vertical bars. Thus the DNA is compared to a spiralling staircase.