Polysaccharides with α-1,6 glycosidic bonds for branching

Steps:

• Amylopectin is a branched glucose polymer with α-1,6 bonds at branch points.
• Glycogen is highly branched like amylopectin, using α-1,6 bonds for its structure.
• Starch comprises amylose (linear, α-1,4 bonds) and amylopectin (branched with α-1,6 bonds), so it contains 1,6 bonds overall.
• All three molecules thus include α-1,6 glycosidic bonds.

Why A is correct:

• Amylopectin and glycogen are branched via α-1,6 glycosidic bonds; starch includes amylopectin, per standard polysaccharide definitions.

Why the others are wrong:

• B excludes starch, which has 1,6 bonds in its amylopectin fraction.
• C excludes glycogen, a branched polymer with α-1,6 linkages.
• D excludes amylopectin, the primary source of branching in starch.

Final answer: A