The following diagram shows the molecular structure of:
1. A hexose sugar
2. An aromatic amino acid
3. A nitrogenous base found in RNA
4. An important constituent of a DNA nucleotide.
3. A nitrogenous base found in RNA
👉NUCLEIC ACIDS
The other type of macromolecule that one would find in the acid
insoluble fraction of any living tissue is the nucleic acid. These are
polynucleotides. Together with polysaccharides and polypeptides these
comprise the true macromolecular fraction of any living tissue or cell.
For nucleic acids, the building block is a nucleotide. 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.
As you notice in Figure 9.1, 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. The skeletal heterocyclic ring
is called as purine and pyrimidine respectively. The sugar found in
polynucleotides is either ribose (a monosaccharide pentose) or 2’
deoxyribose. A nucleic acid containing deoxyribose is called
deoxyribonucleic acid (DNA) while that which contains ribose is called
ribonucleic acid (RNA).
