How many water molecules were released during formation of each of the three pol

Question

How many water molecules were released during formation of each of the three polysaccharides listed in the table above? Explain your answer.

polysaccharide type: amylopectin    
cell type: plant
polymer size: 100,000,000
average number of 1,4 bonds between branches: 27

polysaccharide type: amylose
cell type: plant
polymer size: 500,000
average number of 1,4 bonds between branches: linear

polysaccharide type: glycogen
cell type: animal
polymer size: 3,000,000
average number of 1,4 bonds between branches: 10

Pwbmers of yhicose vnits ae tsed as tethpotnty fosned sturage in both plant and animal cels. Nhe u are vustected to one ahother by f tlinkages to make a linear polymer and by tyness of ghesse units ae -lkages to wake bnaieh pointh aits are sed ss i Pelymer Linkages Polysacchattides of gluesse units vary in siee. The three most commonly encountered are: Average Number of 1,4- Bonds Between Branches Polysaceharide Type Cell type Polymer Size Amy lose Gtyengen Plant Plant Animal 100,000,000 500,000 3,000,000 27 linear 10 2) How many water molecules were released during formation of each of the three polysaccharides listed in the table above? Explain your answer.

Explanation / Answer

Polysaccharides are formed by linkage of monosaccharide units like glucose by condensation reaction.

In a linear chain in polysaccharide are polysaccharide is formed by 1,4 glycosidic bonds(by condensation reaction) whereas at the position of branching by 1,6 glycosidic bonds are formed in a branched polymer. During formation of a 1, 4 or 1,6 glycosidic bond one hydroxide ion is released by one glucose molecule and a hydrogen ion is released by another glucose molecule. These hydroxide (OH-) and hydrogen (H+) ion combine to form a water molecule. Hence the number of water released during formation of linear or branched polysaccharides will be equal to one less than the number of glucose monosaccharide units involved in the given polymer formed.

Number of water molecules released for linear polymer= Size of polymer

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