A Levels Biology (9700)•9700/11/M/J/18

Explanation
Biochemical Polymer Formation
Steps:
- Examine the diagram: Circle 1 shows bond formation with water loss, indicating condensation.
- Circle 2 depicts polysaccharide chains from glucose monomers, representing carbohydrates.
- Circle 3 shows ester linkages between glycerol and fatty acids, representing lipids.
- Match to options: Only A correctly assigns 1 as formation process, 2 as carbohydrates, 3 as lipids.
Why A is correct:
- Condensation reactions form both carbohydrates (via glycosidic bonds) and lipids (via ester bonds) by dehydration synthesis, as defined in biochemistry.
Why the others are wrong:
- B: Swaps 2 and 3, mismatching diagram's carbohydrate and lipid representations.
- C: Uses "by condensation" for 1 instead of "formed," altering the exact labeling.
- D: Specifies hydrolysis for 1, which breaks bonds rather than forms them.
Final answer: A
Topic: Carbohydrates and lipids
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