A Levels Biology (9700)•9700/12/M/J/21

Explanation
Correct sequence of carbohydrate polymer-monomer-polymer
Steps:
- Identify key carbohydrates: α-glucose is the monosaccharide monomer; starch and glycogen are polysaccharides built from it.
- Classify terms: sucrose (disaccharide), sucrase (enzyme, not a carbohydrate), starch/glycogen (polysaccharides).
- Eliminate rows with unrelated or misspelled terms.
- Select row linking plant polysaccharide (starch), monomer (α-glucose), and animal polysaccharide (glycogen).
Why D is correct:
- Starch and glycogen are both α-glucose polymers, with starch in plants and glycogen in animals, forming a logical row per carbohydrate structure definitions.
Why the others are wrong:
- A: Includes sucrose (disaccharide from glucose-fructose) and misspelled "stach," mixing unrelated types.
- B: "α-gluegen" misspells glucose; sucrase is an enzyme, not a carbohydrate.
- C: Starts with monomer then polymers, reversing the typical polymer-to-monomer classification order.
Final answer: D
Topic: Carbohydrates and lipids
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