A Levels Biology (9700)•9700/12/M/J/18

Explanation
Identifying the polysaccharide from glucose linkages and structure
Steps:
- Examine the diagram for glycosidic bond type: alpha-1,4 and alpha-1,6 indicate branching.
- Confirm it's a glucose polymer, ruling out other sugars.
- Note the branched structure, typical of animal storage carbs.
- Match to glycogen, which has branches every 8-12 residues.
Why C is correct:
- Glycogen is a branched polymer of glucose with alpha-1,4 and alpha-1,6 linkages, matching diagrams of its structure for rapid energy release in animals.
Why the others are wrong:
- A. Amylose is linear with only alpha-1,4 linkages, lacking branches.
- B. Cellulose has beta-1,4 linkages, forming straight chains for plant support.
- D. Starch includes amylose (linear) and amylopectin (less branched than glycogen).
Final answer: C
Topic: Carbohydrates and lipids
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