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Biomolecules — Chemistry STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 ScienceChemistryBiomolecules3 Marks
Question
Write a note on chemical composition of nucleic acid compounds.
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Answer

→Complete hydrolysis of DNA (or RNA) yields a pentose sugar, phosphoric acid and nitrogen containing hetero cyclic compounds (called bases).
→In DNA molecules the sugar moiety is ẞ-D-2 deoxy-ribose where as in RNA molecule it is β-D-ribose.
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→DNA contains four bases viz, adenine (A), guanine (G), cytosine (C) and thymine (T). RNA also contains four bases, the first three bases are same as in DNA but the fourth one is uracil (U).
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