Loading subject…

A1.1 Water

A1.2 Nucleic acids

A2.1 Origins of cells (HL)

A2.2 Cell structure

A2.3 Viruses (HL)

A3.1 Diversity of organisms

A3.2 Classification and cladistics (HL)

A4.1 Evolution and speciation

A4.2 Conservation of biodiversity

B1.1 Carbohydrates and lipids

B1.2 Proteins

B2.1 Membranes and membrane transport

B2.2 Organelles and compartmentalization

B2.3 Cell specialization

B3.1 Gas exchange

B3.2 Transport

B3.3 Muscle and motility (HL)

B4.1 Adaptation to environment

B4.2 Ecological niches

C1.1 Enzymes and metabolism

C1.2 Cell respiration

C1.3 Photosynthesis

C2.1 Chemical signalling (HL)

C2.2 Neural signalling

C3.1 Integration of body systems

C3.2 Defense against disease

C4.1 Populations and communities

C4.2 Transfer of energy and matter

D1.1 DNA replication

D1.2 Protein synthesis

D1.3 Mutations and gene editing

D2.1 Cell and nuclear division

D2.2 Gene expression (HL)

D2.3 Water potential

D3.1 Reproduction

D3.2 Inheritance

D3.3 Homeostasis

D4.1 Natural selection

D4.2 Sustainability and change

D4.3 Climate change

IB Biology Topic B2.3: Cell Specialization Lessons

Written by IB Experts

This lesson delivers structured, step-by-step lessons that guide students through every part of the IB Biology syllabus for B2.3 Cell specialization. These lessons simplify complex ideas like molecular biology, evolutionary mechanisms, and homeostasis, while worked examples show how to approach IB-style questions.

Designed for both HL and SL learners, RevisionDojo lessons ensure students not only understand the theory but also know how to apply it in IB Paper exam situations.

With clear explanations, active learning checks, and a syllabus-first design, RevisionDojo makes revision less overwhelming and more effective.

B2.3.1 Production of unspecialized cells following fertilization and their development

B2.3.2 Properties of stem cells

B2.3.3 Location and function of stem cell niches in adult humans

B2.3.4 Differences between totipotent, pluripotent and multipotent stem cells

B2.3.5 Cell size as an aspect of specialization

B2.3.6 Surface area-to-volume ratios and constraints on cell size

B2.3.7 Adaptations to increase surface area-to-volume ratios of cells (HL)

B2.3.8 Adaptations of type I and type II pneumocytes in alveoli (HL)

B2.3.9 Adaptations of cardiac muscle cells and striated muscle fibres (HL)

B2.3.10 Adaptations of sperm and egg cells (HL)

IB Biology Topic B2.3: Cell Specialization Lessons

A - Unity and Diversity

B - Form and Function

C - Interaction and Interdependence

D - Continuity and Change

A - Unity and Diversity

B - Form and Function

C - Interaction and Interdependence

D - Continuity and Change

IB Biology Topic B2.3: Cell Specialization Lessons

Lessons for B2.3 Cell specialization - IB

IB Biology Topic B2.3: Cell Specialization Lessons