question_answer 31)

  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:

                  (a) Polysaccharide is linked by glycosidic bond. Glycosidic bond is a type of covalentbond joining simple or units carbohydrate molecules together to form a long chainpolysaccharide. (b) Protein are linked by peptide bonds. Peptide bond is a covalent chemical bond formed between two amino acids when the carboxyl group of one reacts with the aminogroup of other causing release of water molecule. Hence, called as dehydrationsynthesis reaction (condensation reaction). Peptide bonds between a chain of amino acids results in the formation of protein. (c) Ester bonds are formed by the reaction between carboxyl group of fatty acid andhydroxyl group of triglycerols to form fat. Water is eliminated during this reaction.                                 (d) Hydrogen bond is electrovalent interaction between polar molecules in whichhydrogen is bound to a highly electronegative atom, such as N, 0, S, F, etc. Water is thebest known example