A Unity and diversity
A1.2 Nucleic acids; Answer (A1.2)
A2.1 Origins of cells (AHL only); Answer (A2.1)
A2.2 Cell structure; Answer (A2.2)
A2.3 Viruses (AHL only); Answer (A2.3)
A3.1 Diversity of organisms; Answer (A3.1)
A3.2 Classification and cladistics; Answer (A3.2)
A4.1 Evolution and speciation; Answer (A4.1)
A4.2 Conservation of biodiversity; Answer (A4.2)
B Form and function
B1.1 Carbohydrates; Answer (B1.1)
B2.1 Membranes and membrane transport; Answer (B2.1)
B2.2 Organelles and compartmentalization; Answer (B2.2)
B2.3 Cell specialization; Answer (B2.3)
B3.1 Gas exchange; Answer (B3.1)
B3.3 Muscle and motility; Answer (B3.3)
B4.1 Adaptation to environment; Answer (B4.1)
B4.2 Ecological niche; Answer (B4.2)
C Interaction and interdependence
C1.1 Enzymes and metabolism; Answer (C1.1)
C1.2 Cell respiration; Answer (C1.2)
C1.3 Photosynthesis; Answer (C1.3)
C2.1 Chemical signaling (AHL only); Answer (C2.1)
C2.2 Neural signaling; Answer (C2.2)
C3.1 System integration; Answer (C3.1)
C3.2 Defence against disease; Answer (C3.2)
C4.1 Populations and Communities; Answer (C4.1)
C4.2 Transfer of energy and matter; Answer (C4.2)
D Continuity and change
D1.1 DNA Replication; Answer (D1.1)
D1.2 Protein synthesis; Answer (D1.2)
D1.3 Mutation and gene editing; Answer (D1.3)
D2.1 Cell and nuclear division; Answer(D2.1)
D2.2 Gene expression (AHL only); Answer (D2.2)
D2.3 Water potential; Answer (D2.3)
D3.1 Reproduction; Answer (D3.1)
D3.2 Inheritance; Answer (D3.2)
D3.3 Homeostasis; Answer (D3.3)
D4.1 Natural selection; Answer (D4.1)
D4.2 Stability and change; Answer (D4.2)
D4.3 Climate change; Answer (D4.3)
Revision questions
(Revision questions are broadly categorized into 1. Molecules, 2. Cells, 3. Organism and 4. Ecosystem)
Revision Question 1 (4. Ecosystems)
Revision Question 2 (1. Molecules)
Revision Question 3 (4. Ecosystems)
Revision Question 4 (4. Ecosystems)
Revision Question 5 (4. Ecosystems)
Revision Question 7 (1. Molecules)
Revision Question 8 (1. Molecules)
Revision Question 9 (1. Molecules )
Revision Question 10 (2. Cells)
Revision Question 11 (1. Molecules )
Revision Question 12 (1. Molecules)
Revision Question 13 (1. Molecules)
Revision Question 14 (1. Molecules)
Revision Question 15 (1. Molecules)
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