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B1.2.6 (HL)—Chemical diversity in R-groups

R-groups differ in polarity, charge, acidity, basicity and hydrophobicity, determining amino-acid interactions, folding, solubility and protein location in cells broadly.

Syllabus
First assessment 2025
Objective
B1.2.6
Level
HL

Exam analysis

Chance of appearing2%of analysed past papers
Latest appearanceMay 2023
Most common paperPaper1
Typical marks1–2

Common command terms

  • Discuss

Recent exam appearances

May 2023Paper2 ["HL"] · TZ12(c)[ 2 ]B1.2.6 (HL)—Chemical diversity in R-groups
November 2019Paper1 ["HL"] · TZ028[ 1 ]B1.2.6 (HL)—Chemical diversity in R-groups
Practice this objective

Coverage 2019–2023 · Updated 15 Jul 2026

Concept essentials

  • R-groups are chemically diverse and determine amino-acid properties.
  • Polar R-groups interact favourably with aqueous environments.
  • Non-polar R-groups often cluster away from water or face membrane lipid tails.
  • R-group chemistry helps stabilize tertiary structure and protein function.
ConceptIB Biology HL