Selected student pages
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Introduction to the site Free
This is a short guide to the student pages of the InThinking Biology site. In this section students access learning activities, revision resources and other resources giving expert guidance tailored for...
Activities
Inhibition of Enzymes HL (2025)
Following a quick review of enzyme inhibition students complete questions which help to form structured notes. A second activity is an analysis of an experiment testing the rate of an enzyme reaction...
Activities
Hardy Weinberg - model answers
The document below shows model answers to the questions on the Hardy-Weinberg calculation on moths found on the page Evolution & Hardy-Weinberg equation (2025) Teachers can control access to these answers...
Activities
Adaptations of haemoglobin HL (2025)
Haemoglobin is specifically adapted for the transport of oxygen. Here we explore how this molecule binds to oxygen and how high levels of carbon dioxide can cause an increase the oxygen dissociation in...
Activities
Gas exchange surfaces (2025)
This is a short series of activities that introduces the concepts of how surface area-to-volume ratio can influence the need for a gas exchange system. It also addresses the properties of gas exchange...
Activities
Onion osmosis - Lab technician prep sheet (copy)
This experiment is a good introduction to data processing and illustrates skills needed for success in data analysis questions in IB exams. Students use techniques learned earlier in the topic to prepare...
eBook
A2.2 Cell structure - eBook
Theme A - Unity and diversity & Level 2 - Cells This topic explores the ultrastructure of both eukaryote and prokaryote cells. Students use microscopes to produce images of cells and to consider the...
Activities
Root pressure & translocation HL - model answers
These are suggested model answers for the activity Phloem structure and function worksheet on the page Root pressure & translocation HL (2025) As model answers they don't cover all the possible options...
Activities
Mitosis and the Cell Cycle (2025) Free
Mitosis is a miraculous process. In the making of the three trillion cells of our bodies it manages to faithfully replicate and share the chromosomes equally between all the daughter cells. This lesson...
Activities
ATP structure and function - model answers Free
These are suggested model answers for the activity, ATP structure and function - IB style questions on the page ATP a suspected cause of long covid (2025) As model answers they don't cover all the possible...
Activities
The human heart HL (2025)
This series of activities explores the structure and function of the human heart. First, the circulatory systems of fish and mammals are compared. Then the structures of the human heart and the stages...
Activities
Osmosis and water potential - model answers
The document below shows some suggestions for answers to the activity questions Water potential IB style questions on the page Poseidon & water potential HL Of course there are other possible answers...