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

(i) Which one of the following is a polysaccharide : starch, maltose,

1.	(i) Which one of the following is a polysaccharide : starch, maltose, fructose, glucose . (ii) Write one difference between a-helix and B-pleated sheet structure of protein. (iii) Write the name of the disease caused by the deficiency of vitamin B_(12).
Answer» Solution :(i) STRACH ispolysaccharide . (ii) In `alpha` -helix STRUCTURE, a polypeptide chain forms all possible hydrogen bonds by twisting into a right handed screw with the -NH group of each amino acid residue hydrogen bonded to `>C= O` of an adjacent turn of the helix. In B-structure, all peptide chains are stretched out to nearly maximum extension and then laid side by side which are held TOGETHER by intermolecular hydrogen bonds. This structure resembles the PLEATED folds of drapery. (iii) Deficiency of vitamin `B_(12)` causes pernicious anaemia (RBC deficient in haemoglobin).