Question

Monosaccharides are joined together to form (1,4) polysaccharides by:

A. phosphorylation of monosaccharides to form glucose-6 phosphate, followed by cleavage of ATP

B. a dehydration reaction joining the hydroxyl groups of the on the two monosaccharides to form a glycosidic bond

C. a dehydration reaction joining an amino group and a carboxylic acid group on the 1’ and 4’ carbons of two monosaccharides

D. formation of a phosphodiester bond at the 1’ and 4’ carbons of two monosaccharides

Answer 1

Ans - a dehydration reaction joining the hydroxyl groups of the on the two monosaccharides to form a glycosidic bond. is correct option.

When a polymer is formed from a monomer a condensation reaction occurs that forms a glyosidic bond. A condensation reaction involves the formation of water (H2O), as one oxygen atom and two hydrogen atoms are removed from the monosaccharides. This covalent bond joins the monosaccharide together to form a disaccharide.

the glyosidic bond is connects two carbons together formed; number 1 carbon from α-glucose is connected to number 4 carbon.