Explain how the structure of amylose differs from that of amylopectin, and suggest one functional consequence of each structural difference identified.

Amylose is a linear chain of α‑D‑glucose units linked only by α‑1,4‑glycosidic bonds, whereas amylopectin contains the same α‑1,4‑links but also has α‑1,6‑glycosidic bonds at branch points every 24–30 glucose units.

Because amylose is unbranched it can adopt a tight, right‑handed helix, which allows the molecules to pack closely together and form dense granules.

The branching in amylopectin creates many chain ends; this gives the polymer a highly branched, tree‑like structure.

Functional consequence of amylose’s linearity: the compact helical packing makes it less readily accessible to enzymes, so it is digested more slowly.

Functional consequence of amylopectin’s branching: the numerous free ends provide more sites for α‑amylase, leading to rapid hydrolysis and a quicker release of glucose when energy is required.