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IB Biology HL - 2025 - Key Concepts

In the IB Biology HL (Higher Level) 2025 Key Concepts section, you will find summary videos that will help you review the most important concepts and skills necessary for success. They are ideal for a quick refresher before tackling questions in the Revision Village Questionbank or Practice Exams sections of the website.

You can now access audio versions of Key Concepts on the Revision Village Podcast

Level of Organisation 1

Molecules

Level of Organisation 1

Molecules

Protein Synthesis

Protein Synthesis video thumbnail

9 minutes

Codons, Degeneracy, and Sickle Cell

Codons, Degeneracy, and Sickle Cell video thumbnail

10 minutes

The Electron Transport Chain and Chemiosmosis

The Electron Transport Chain and Chemiosmosis video thumbnail

8 minutes

Carbohydrates and Lipids

Carbohydrates and Lipids video thumbnail

12 minutes

Structure and Function of Proteins

Structure and Function of Proteins video thumbnail

18 minutes

Water

Water video thumbnail

15 minutes

Enzymes

Enzymes video thumbnail

11 minutes

DNA Replication

DNA Replication video thumbnail

9 minutes


Level of Organisation 1

Molecules

Protein Synthesis

Protein Synthesis video thumbnail

9 minutes

Codons, Degeneracy, and Sickle Cell

Codons, Degeneracy, and Sickle Cell video thumbnail

10 minutes

The Electron Transport Chain and Chemiosmosis

The Electron Transport Chain and Chemiosmosis video thumbnail

8 minutes

Carbohydrates and Lipids

Carbohydrates and Lipids video thumbnail

12 minutes

Structure and Function of Proteins

Structure and Function of Proteins video thumbnail

18 minutes

Water

Water video thumbnail

15 minutes

Enzymes

Enzymes video thumbnail

11 minutes

DNA Replication

DNA Replication video thumbnail

9 minutes

Level of Organisation 2

Cells

Level of Organisation 2

Cells

Cell Structure and Function

Cell Structure and Function video thumbnail

11 minutes

The Nervous System 1

The Nervous System 1 video thumbnail

10 minutes

The Nervous System 2

The Nervous System 2 video thumbnail

7 minutes

Cell Specialisation

Cell Specialisation video thumbnail

15 minutes

Mitosis, Cytokinesis & The Cell Cycle

Mitosis, Cytokinesis & The Cell Cycle video thumbnail

18 minutes

Cell Cycle - Mutagens & Cancer

Cell Cycle - Mutagens & Cancer  video thumbnail

9 minutes


Level of Organisation 2

Cells

Cell Structure and Function

Cell Structure and Function video thumbnail

11 minutes

The Nervous System 1

The Nervous System 1 video thumbnail

10 minutes

The Nervous System 2

The Nervous System 2 video thumbnail

7 minutes

Cell Specialisation

Cell Specialisation video thumbnail

15 minutes

Mitosis, Cytokinesis & The Cell Cycle

Mitosis, Cytokinesis & The Cell Cycle video thumbnail

18 minutes

Cell Cycle - Mutagens & Cancer

Cell Cycle - Mutagens & Cancer  video thumbnail

9 minutes

Level of Organisation 3

Organisms

Level of Organisation 3

Organisms

The Cardiovascular System

The Cardiovascular System video thumbnail

22 minutes

The Musculoskeletal System I

The Musculoskeletal System I video thumbnail

7 minutes

The Musculoskeletal System II

The Musculoskeletal System II video thumbnail

10 minutes

The Respiratory System

The Respiratory System video thumbnail

10 minutes

Homeostasis, Hormones and the Menstrual Cycle

Homeostasis, Hormones and the Menstrual Cycle video thumbnail

10 minutes

Inheritance

Inheritance video thumbnail

16 minutes


Level of Organisation 3

Organisms

The Cardiovascular System

The Cardiovascular System video thumbnail

22 minutes

The Musculoskeletal System I

The Musculoskeletal System I video thumbnail

7 minutes

The Musculoskeletal System II

The Musculoskeletal System II video thumbnail

10 minutes

The Respiratory System

The Respiratory System video thumbnail

10 minutes

Homeostasis, Hormones and the Menstrual Cycle

Homeostasis, Hormones and the Menstrual Cycle video thumbnail

10 minutes

Inheritance

Inheritance video thumbnail

16 minutes

Level of Organisation 4

Ecosystems

Level of Organisation 4

Ecosystems

Energy in Ecosystems

Energy in Ecosystems video thumbnail

8 minutes

Carbon Cycle

Carbon Cycle video thumbnail

11 minutes

Evolution and Speciation

Evolution and Speciation video thumbnail

14 minutes


Level of Organisation 4

Ecosystems

Energy in Ecosystems

Energy in Ecosystems video thumbnail

8 minutes

Carbon Cycle

Carbon Cycle video thumbnail

11 minutes

Evolution and Speciation

Evolution and Speciation video thumbnail

14 minutes