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Q.(x) What is a polysaccharide? Explain with an example. (y) What is meant by primary structure of a protein?

West Bengal WbchseWest Bengal HS (WBCHSE) Board 2016Subjective· 3mImportance★★★★★
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Polysaccharides are glycosidically-linked polymers of monosaccharides (e.g. starch); a protein's primary structure is simply the order of amino acids in its chain.

(x) Polysaccharide: A polysaccharide is a complex carbohydrate formed by the condensation-polymerisation of a large number of monosaccharide units, linked together by glycosidic bonds (with loss of water at each linkage). Polysaccharides are usually insoluble in water and lack sweet taste, unlike simple sugars.

Example: Starch is a polysaccharide made entirely of α-D-glucose units, joined by glycosidic linkages, occurring as two components — amylose (linear, α-1,4 linkages) and amylopectin (branched, with additional α-1,6 linkages). It is the principal storage carbohydrate in plants.

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