Chapter 147 of 2363 min read
Nucleic acids
Why this is asked: Chargaff's rule lets you find all four base percentages in double-stranded DNA from just one — %A = %T and %G = %C, so purines always equal pyrimidines overall, a calculation NEET poses directly. Structurally: DNA's sugar is deoxyribose (no 2'-OH) against RNA's ribose, DNA pairs A with T using 2 hydrogen bonds where RNA substitutes uracil for thymine, and G pairs with C using 3 — so a strand richer in G-C is more thermally stable.
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