Chitin is a complex polysaccharide which has a branched, linear chain formed by nitrogen containing monosaccharide N-acetyl glucosamine. It is a homoplymer. It forms the exoskeletons of arthropods and cell wall of bacteria and fungi.
(2) These are easy to store; because they are insoluble in water, therefore, osmotically inactive.
(3) These can easily be broken down by enzymes for release of energy.