Class 12 · Molecular Basis of Inheritance

DNA Structure: Double Helix Model — NEET Biology

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It is made of two polynucleotide chains, where the backbone is constituted by sugar-phosphate, and the bases project inside.

NCERT Biology · Class 12 · Chapter 5 · Paragraph 11
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Adjacent to a frequently-asked paragraph in the same chapter.

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The sugar in DNA is:

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