Glycogen's key traits: branched animal storage polysaccharide

Steps:

• Identify glycogen as a glucose polymer for energy storage in animals, not plants.
• Note its highly branched structure via α-1,4 and α-1,6 glycosidic bonds for rapid glucose release.
• Compare to table rows: seek branched, storage function, and presence indicators matching animal origin.
• Select row A, as it aligns with ✓ for animal presence, branched form, storage role, and ✓ for dietary/human relevance.

Why A is correct:

• Glycogen is defined as a branched storage polysaccharide in animal liver and muscles, enabling quick energy mobilization per its α-linked glucose structure.

Why the others are wrong:

• B: Describes helical storage like amylose (plant starch component), but glycogen is branched, not helical.
• C: Matches branched but labels it structural (e.g., like chitin), whereas glycogen is storage, not structural.
• D: Fits helical structural like cellulose, but glycogen lacks helical form and structural function.

Final answer: A