B1.2.7 (HL)—Primary structure impact
Primary structure is the amino-acid sequence of a polypeptide, and sequence changes can alter folding, properties and protein safety outcomes.
- Syllabus
- First assessment 2025
- Objective
- B1.2.7
- Level
- HL
Exam analysis
Chance of appearing2%of analysed past papers
Latest appearanceNovember 2018
Most common paperPaper2
Typical marks1–3
Common command terms
- Analyse
- Outline
Recent exam appearances
November 2018Paper2 ["HL"] · TZ02(a)(ii)[ 1 ]B1.2.7 (HL)—Primary structure impact
May 2018Paper3 ["HL"] · TZ212(b)[ 3 ]B1.2.7 (HL)—Primary structure impact
Practice this objective
Coverage 2018–2018 · Updated 15 Jul 2026
Concept essentials
- Primary structure is the ordered amino-acid sequence of a polypeptide.
- DNA and mRNA sequences determine the amino-acid order during protein synthesis.
- Amino-acid sequence influences later folding and protein properties.
- Sequence comparison can be used to evaluate similarity between proteins.