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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 C1.1: Enzymes and Metabolism 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 C1.1 Enzymes and metabolism. 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.

C1.1.1 Enzymes as catalysts

C1.1.2 Role of enzymes in metabolism

C1.1.3 Anabolic and catabolic reactions

C1.1.4 Enzymes as globular proteins with an active site for catalysis

C1.1.5 Interactions between substrate and active site to allow induced-fit binding

C1.1.6 Role of molecular motion and substrate-active site collisions in enzyme catalysis

C1.1.7 The structure of the active site, enzyme–substrate specificity and denaturation

C1.1.8 Effects of temperature, pH and substrate concentration on the rate of enzyme activity

C1.1.9 Measurements in enzyme-catalysed reactions

C1.1.10 Effect of enzymes on activation energy

C1.1.11 Intracellular and extracellular enzyme-catalysed reactions (HL)

C1.1.12 Generation of heat energy by the reactions of metabolism (HL)

C1.1.13 Cyclical and linear pathways in metabolism (HL)

C1.1.14 Allosteric sites and non-competitive inhibition (HL)

C1.1.15 Competitive inhibition (HL)

C1.1.16 Regulation of metabolic pathways by feedback inhibition (HL)

C1.1.17 Mechanism-based inhibition (HL)

IB Biology Topic C1.1: Enzymes and Metabolism 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 C1.1: Enzymes and Metabolism Lessons

Lessons for C1.1 Enzymes and metabolism - IB

IB Biology Topic C1.1: Enzymes and Metabolism Lessons