Structure of DNA and RNA — Predicted 2026

AI-Predicted Question Angles for UPSC 2026

Based on trend analysis, current affairs, and recurring themes in Structure of DNA and RNA.

Application of Chargaff's Rule in complex scenarios

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While basic Chargaff's rule problems are common, NEET might introduce slightly more complex scenarios, such as asking for the ratio of purines to pyrimidines, or providing information about one strand of DNA and asking about the overall double helix composition. This tests a deeper understanding beyond simple A=T, G=C calculations, requiring students to synthesize information about both strands.

Detailed structural features and their functional implications

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Beyond just knowing the presence of 2'-OH in ribose, questions might delve into *why* it makes RNA less stable or why the antiparallel nature is crucial for replication. Similarly, the significance of major and minor grooves for protein binding could be explored. This moves beyond rote memorization to understanding the 'why' behind the structure.

Identification of bonds in a given nucleic acid segment

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A diagrammatic question showing a short segment of DNA or RNA could ask students to identify phosphodiester bonds, glycosidic bonds, or hydrogen bonds. It might also ask to count the total number of specific bonds (e.g., phosphodiester bonds in a polynucleotide of 'n' nucleotides, or hydrogen bonds in a given sequence). This tests visual recognition and precise counting skills.