They are broadly classified into three groups —
monosaccharides, disaccharides and polysaccharides Glucose, the most important
source of energy for mammals,  is obtained by the digestion of starch Monosaccharides
are held together by glycosidic linkages to form disaccharides or polysaccharides Proteins are the polymers of about twenty different aaaaa-amino acids which are
linked by peptide bonds