C1.3.18 (HL)—Synthesis of other compounds Topic Practice
C1.3.18 (HL)—Synthesis of other compounds Topic Practice

IB Biology syllabusBiology SL/HLFirst assessment 2025
Students practise tracing how triose phosphate and mineral nutrients serve as carbon and nitrogen sources for synthesising sugars, starch, lipids, amino acids, and organic acids.
How this is tested
- link triose phosphate to synthesis pathways for sucrose, starch, and glycerol backbone of lipids
- apply knowledge of mineral nutrient roles to explain amino acid or nucleotide biosynthesis
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