AP BIOLOGY

Detailed explanation-1: -Amylose is an unbranched version of starch that only contains alpha-1, 4-glycosidic bonds . Amylopectin is the branched version of starch; it contains both the alpha-1, 4-glycosidic bond and the alpha-1, 6-glycosidic bond.

Detailed explanation-2: -Experimental studies have shown that amylose chains make helical structures in single and double-stranded polymorphs.

Detailed explanation-3: -Most starches also contain some amylose molecules which are branched to a small extent (0.1%) by -d-glucopyranose-(1-6)-substituents. Amylose typically forms a left-handed -helical structure, in which six to eight anhydroglucose units make up one turn of the helix.

Detailed explanation-4: -Amylose is a linear polysaccharide in which glucose residues are linked solely by -1, 4 glycosidic bonds. In contrast, amylopectin is a branched molecule in which the branch points consist of -1, 6 glycosidic bonds while the linear portions of the branches are made up of -1, 4 bond as in amylose (Fig.

Detailed explanation-5: -The main difference is the anomeric configureration: amylose’s glucose units are linked with glycosidic bonds, whereas cellulose’s monomeric units are linked by glycosidic bonds. This different kind of bonding causes amylose to form helical structures and cellulose to form straight polymer chains.