Selected student pages
Activities
Intracellular & extracellular HL (2025)
Enzymes produced by cells may not be active inside the cell, they could be used outside the cell. Extracellular enzymes are most often linked to digestion of large molecules whereas intracellular enzymes...
Activities
Pulse rate and coronary heart disease (2025)
This series of activities looks at traditional and modern ways of measuring pulse rates. It then focusses on the causes and consequences of the narrowing of the lumen of coronary arteries. Finally, the...
Activities
Movement & locomotion (2025)
This short series of activities explores the concepts of movement as one of the universal features of living organisms. Motile and sessile species are considered. The reasons for movement are explored...
Activities
Fundamental and realised niches (2025)
The "Niche concept" has many slight variations. This activity introduces the niche concept and the difference between realized and fundamental niches using Paramecium. There is a second activity with...
eBook
D2.2 Gene expression - written task
This structured question is in the style of the IB exam question from paper 2. The activity includes a little introduction about an interesting example of gene expression. It includes “describe” and “explain”...
Activities
The endocrine system (2025)
The endocrine system is made up of glands, without ducts, that release hormones that act to regulate the body's growth, metabolism, sexual development and function. In this series of activities the role...
Activities
Neurons and resting potential (2025)
This series of activities introduces neurons as the specialised cells in the nervous system. These are specially adapted to be able to generate a resting potential and then carry electrical nerve impulses,...
eBook
D1.1 DNA replication - exam practice
Using precise biological terms is essential for success in biology exams. Try the Exam question practice below. Topics: D1.1 DNA replicationLevels: HL only, SL & HL - all students Number of flashcards:...
Activities
Special features of lipids (2025)
Lipid molecules show some exceptional properties when they interact or connect with other molecules. As lipids are hydrophobic when they are connected to a hydrophilic phosphate the two ends of the molecule...
Activities
Compartmentalization - model answers
These are suggested model answers for the short IB style questions in Activity 3 - Separating incompatible functions for the Separating incompatible functions IB style questions in the page Compartmentalization...
eBook
A4.2 Conservation of biodiversity - student friendly summary
This is a student friendly summary list of the IB DP Biology Guide for Topic A4.2 Conservation of biodiversity Unity and diversity - ecosystems SL and HL: 3 hours Guiding questions Ultimately this...
Activities
Sexual selection examples (2025)
This activity looks at two interesting examples of natural selection in action. The first is the sexual selection of mates in birds-of-paradise. These birds have bright feathers and complex songs and...