B1.2 Proteins
Proteins connect amino acid structure, peptide-bond formation, dietary requirements, folding levels, R-group chemistry, denaturation, and functional protein shapes in cells.
- Syllabus
- First assessment 2025
- Topic
- B1.2
- Level
- HL
What you’ll learn
12 learning objectivesChoose one objective for a focused lesson, or study the complete topic.
Exam analysis
An aggregate view of how the complete B1.2 Proteins appears across past papers.
Chance of appearing33%of analysed past papers
Latest appearanceNovember 2025
Most common paperPaper2
Most tested objectives
- B1.2.3—Dietary amino acids8 questions
- B1.2.8 (HL)—Secondary structure8 questions
- B1.2.2—Condensation reactions6 questions
Common question formats
- Definition or recall
- Diagram interpretation
- Process explanation
- Structured response
- Comparison
- Data analysis
Exam question appearances
November 2025Paper1A ["HL"] · TZ33[ 1 ]B1.2.3—Dietary amino acids
November 2025Paper2 ["HL"] · TZ12(c)[ 2 ]B1.2.9 (HL)—Tertiary structure
November 2025Paper2 ["HL"] · TZ12(b)[ 3 ]B1.2.1—Generalized amino acid structure
November 2025Paper2 ["HL"] · TZ12(a)[ 2 ]B1.2.3—Dietary amino acids
May 2025Paper1A ["HL"] · TZ34[ 1 ]B1.2.12 (HL)—Globular vs. fibrous proteins
Practice this topic
1 original exam-style questions based on the patterns above.
Coverage 2012–2025 · Updated 15 Jul 2026