Give the name of one or more polysaccharides that matches...

Give the name of one or more polysaccharides that matches each of the following descriptions:
a. not digestible by humans
b. the storage form of carbohydrates in plants
c. contains only $\alpha(1 \rightarrow 4)$ -glycosidic bonds
d. the most highly branched polysaccharide

Key Concepts

Highly Branched Polysaccharides

These polysaccharides possess a significant number of branch points, enabling rapid mobilization of glucose when needed. Glycogen is the most highly branched among them, acting as the primary energy storage molecule in animals, and its structure allows enzymes to quickly add or remove glucose residues during metabolism.

Polysaccharides with Only Alpha(1?4) Glycosidic Bonds

Some polysaccharides have a simple structure featuring only alpha(1?4) glycosidic bonds; amylose is a prime example. It is a linear chain of glucose units, and this structure differentiates it from its branched counterpart, amylopectin, which also contains alpha(1?6) bonds at the branch points.

Non-Digestible Polysaccharides

These are carbohydrates that humans lack the enzymes to hydrolyze and thus cannot be digested. A classic example is cellulose, a polysaccharide composed of beta(1?4) linked glucose residues, which forms the structural component of plant cell walls and passes through the human digestive system as dietary fiber.

Plant Storage Polysaccharides

Plants store carbohydrates largely in the form of starch, which serves as an energy reserve. Starch is composed of two major components: amylose, a mostly linear polymer, and amylopectin, a branched form, both of which are synthesized by plants for energy storage and later utilization during growth or germination.

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