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  4. Which of the following shows the correct positions of the phosphate (P), sugar (S) and base (B) molecules in the given line diagrams representing the structure of DNA?

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Q. Which of the following shows the correct positions of the phosphate $(P)$, sugar $(S)$ and base $(B)$ molecules in the given line diagrams representing the structure of $DNA$?

Molecular Basis of Inheritance

Solution:

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