Question

(i) Which one of the following is a polysaccharide : starch, maltose, fructose, glucose
(ii) Write one difference between `alpha`-helix and `beta`-pleated sheet structures of protein.
(iii) Write the name of the disease caused by the deficiency of vitamin `B_(12). `

Answer 1

(i) Starch is a polysaccharide.
(ii) `alpha`-hellix: Polypeptide-chcin forms all possible H-bonds by twisting into a right handed helical structure with -NH group of each amino acid residue. Hydrogen bonded to the `gt c = 0` group of an adjacent turn of helix.
`beta`-structure : All peptide chain are stretched out to nearly extension and then laid side by side which are held together by intermolecular Hydrogen bond.
(iii) Pernicious anaemia and scurvy.