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 (Pre-practice note)
Revision Question 1 (4. Ecosystems)
Revision Question 2 (Pre-practice note)
Revision Question 2 (1. Molecules)
Revision Question 3 (Pre-practice note)
Revision Question 3 (4. Ecosystems)
Revision Question 4 (Pre-practice note)
Revision Question 4 (4. Ecosystems)
Revision Question 5 (Pre-practice note)
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)
Revision questions
(Revision sets below are designed by using combinations of a few interrelated topics in order to build up exam skills involving multiple topics)
Summary note (Set A) B1.2 Protein. C1.1 Enzymes and metabolism. D1.2 Protein synthesis. B3.3 Muscle and motility. Answer (Set A)
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