Question

Select an appropriate chemical bond among ester bond, glycosidic bond, peptide bond and hydrogen bond and write against each of the following.
a. Polysaccharide ___________________________
b. Protein ___________________________
c. Fat ___________________________
d. Water ___________________________

Answer 1

Polysaccharide

Polysaccharides are composed of a large number of monosaccharide units joined together with glycosidic bonds. In the formation of a glycosidic bond, a water molecule is released, hence, the process is called dehydration synthesis.

Final answer: Glycosidic bond

Proteins

Proteins are biopolymers composed of amino acids. The constituent amino acids are linked together by a bond known as peptide bond. This bond is formed when the carboxyl group $(-COOH)$ of one amino acid bonds with the amino group $(-N{H}_2)$ of another amino acid releasing a molecule of water $\left(H_{2}O\right)$.



Final answer: Peptide bond

Fat

In a triglyceride molecule, each of the $-COOH$ ends of fatty acids are attached to each of the three $-OH$ of the glycerol molecule with an ester bond. It results in the elimination of three molecules of water (condensation or dehydration).


Final answer: Ester bond

Water

A water molecule consists of two hydrogen atoms bonded to an oxygen atom by a covalent bond. As the oxygen atom is more electronegative, this leads to the development of partial negative charge on the oxygen end of the water molecule while the hydrogen end develops a partial positive charge. As a result,
H2O molecules are loosely connected to each other by the formation of hydrogen bonds.
Final answer: Hydrogen bond