Skip to content
bio letters
IB biology notes
LAST UPDATED: 20
th
May, 2026
7
topic notes left to go
May 2026 Mocks
May 2026 Mock Paper 1A HL
[MARKSCHEME]
May 2026 Mock Paper 2 HL
[MARKSHEME]
Question Bank
A4.1 Paper 1A
[MARKSCHEME]
B1.1 Paper 1A
[MARKSCHME]
B2.1 Paper 1A
[MARKSCHEME]
NEW
B2.3 Paper 1A
[MARKSCHEME]
C4.1 Paper 1A
[MARKSCHEME]
C4.2 Paper 1A
[MARKSCHEME]
C4.2 Paper 2
[MARKSCHEME]
Notes
A1.1 Water
A1.2 Nucleic acids
A2.2 Cell Structure
A2.3 Viruses
A4.1 Evolution and speciation
A4.2 Conservation of biodiversity
B1.1 Carbohydrates and lipids
B1.2 Proteins
B2.1 Membranes and membrane transport
NEW
B2.2 Organelles and compartmentalization
B2.3 Cell specialization
B3.1 Gas exchange
B3.2 Transport
B3.3 Muscle and motility
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
C2.2 Neural signalling
C3.1 Integration of body systems
C3.2 Defence against disease
C4.1 Populations and communities
C4.2 Transfer of energy and matter
D1.1 DNA Replication
D1.2 Protein synthesis
D1.3 Mutation and gene editing
D2.2 Gene expression
D3.1 Reproduction
D3.2 Inheritance
D3.3 Homeostasis
D4.1 Natural selection
Subscribe
Subscribed
bio letters
Sign me up
Already have a WordPress.com account?
Log in now.
bio letters
Subscribe
Subscribed
Sign up
Log in
Report this content
View site in Reader
Manage subscriptions
Collapse this bar
bio letters 