B1.2.4—Infinite variety of peptide chains
Protein diversity arises because amino acids can be linked in enormous numbers of different orders and chain lengths through translation.
- Syllabus
- First assessment 2025
- Objective
- B1.2.4
- Level
- HL
Exam analysis
Chance of appearing2%of analysed past papers
Latest appearanceMay 2025
Most common paperPaper2
Typical marks2–7
Common command terms
- Explain
- Describe
Recent exam appearances
May 2025Paper2 ["HL"] · TZ12(b)[ 2 ]B1.2.4—Infinite variety of peptide chains
May 2023Paper2 ["HL"] · TZ27(a)[ 7 ]B1.2.4—Infinite variety of peptide chains
Practice this objective
Coverage 2023–2025 · Updated 15 Jul 2026
Concept essentials
- Protein primary structure depends on amino-acid number, type and order.
- Genes encode polypeptide sequences through transcription and translation.
- Different R-groups give amino acids different chemical properties.
- Many possible amino-acid sequences create a huge variety of proteins.