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Question
Define glycosidic, peptide and a phosphodiester bond.
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Solution
In a polypeptide or a protein, amino acids are linked by a peptide
bond which is formed when the carboxyl (-COOH) group of one amino acid
reacts with the amino (-NH2) group of the next amino acid with the
of water molecule.
In a polysaccharide the individual
monosaccharides are linked by glycosidic bond. This bond is also formed
by dehydration. This bond is formed between two carbon atoms of
two adjacent monosaccharides.
In a nucleic acid a
phosphate moiety links the 3-carbon of one sugar of one nucleotide
to the 5'-carbon of the sugar of the succeeding nucleotide. The bond
between phosphate and hydroxyl group of sugar is an ester bond. As there
is one such ester bond on either side, it is called phosphodiester
bond.
In a polypeptide or a protein, amino acids are linked by a peptide
bond which is formed when the carboxyl (-COOH) group of one amino acid
reacts with the amino (-NH2) group of the next amino acid with the
of water molecule.
In a polysaccharide the individual
monosaccharides are linked by glycosidic bond. This bond is also formed
by dehydration. This bond is formed between two carbon atoms of
two adjacent monosaccharides.
In a nucleic acid a
phosphate moiety links the 3-carbon of one sugar of one nucleotide
to the 5'-carbon of the sugar of the succeeding nucleotide. The bond
between phosphate and hydroxyl group of sugar is an ester bond. As there
is one such ester bond on either side, it is called phosphodiester
bond.
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