Assertion : The heterocyclic compounds in nucleic acid are the nitrogenous bases.\ Reason : Adenine

Question

Assertion : The heterocyclic compounds in nucleic acid are the nitrogenous bases.\ Reason : Adenine and guanine are substituted pyrimidines while uracil, cytosine and thymine are substituted purines.\

Professor PC Thomas Classes · Answer

(c) : Nucleic acids are polynucleotides. A nucleotide has three chemically distinct components. One is a heterocyclic compound, the second is a monosaccharide and the third a phosphoric acid or phosphate. The heterocyclic compounds in nucleic acids are the nitrogenous bases named adenine, guanine, uracil, cytosine and thymine. Adenine and guanine are substituted purines while the rest are substituted pyrimidines formed from the skeletal heterocyclic rings purine and pyrimidine, respectively.