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B2.2 Organelles and compartmentalization

Organelles and compartmentalization explain how eukaryotic cells divide work among specialized structures, controlled internal spaces, and directed vesicle transport routes.

Syllabus
First assessment 2025
Topic
B2.2
Level
HL

What you’ll learn

9 learning objectives

Choose one objective for a focused lesson, or study the complete topic.

Exam analysis

An aggregate view of how the complete B2.2 Organelles and compartmentalization appears across past papers.

Chance of appearing27%of analysed past papers
Latest appearanceNovember 2025
Most common paperPaper1

Most tested objectives

  1. B2.2.7 (HL)—Free ribosomes vs. rough ER12 questions
  2. B2.2.4 (HL)—Mitochondrion adaptations8 questions
  3. B2.2.5 (HL)—Chloroplast adaptations6 questions

Common question formats

  • Definition or recall
  • Diagram interpretation
  • Process explanation
  • Structured response
  • Extended response

Exam question appearances

November 2025Paper1A ["HL"] · TZ316[ 1 ]B2.2.6 (HL)—Nuclear membrane benefits
November 2025Paper1A ["HL"] · TZ116[ 1 ]B2.2.4 (HL)—Mitochondrion adaptations
November 2025Paper1B ["HL"] · TZ31(c)[ 2 ]B2.2.1—Organelles as discrete subunits
May 2025Paper2 ["HL"] · TZ39(a)[ 4 ]B2.2.3—Advantages of compartmentalization
May 2025Paper1A ["HL"] · TZ215[ 1 ]B2.2.9 (HL)—Vesicles in cells
Practice this topic

3 original exam-style questions based on the patterns above.

Coverage 2012–2025 · Updated 15 Jul 2026

Study checklistB2.2 Organelles and compartmentalization