Activities
Systems integration (2025)
This short series of videos and quick questions introduce the concepts of system integration and control of living organisms, through levels of organisation, nervous action and the endocrine system. How...
Activities
Chromatography & absorption spectrum (2025)
Students investigate a simple practical method of separating photosynthetic pigments using paper chromatography or thin layer chromatography. There is an animation of chromatography and some slides which...
Activities
Excitatory and inhibitory synaptic transmission HL (2025)
So far, only excitatory neurotransmitters such as ACh have been considered. However, neurotransmitters can also be inhibitory too. In this lesson, these will be considered first. Then, interactions between...
Activities
Mutations - further qns model answers
The document below shows some suggestions for answers to the activity questions Questions about beneficial and harmful mutations on the page Mutations - further details Of course there are other possible...
Activities
Mutations - further details
Gene mutation can be caused by chemical mutagens and by radiation. Errors in DNA replication or in the proteins which control repair of DNA can malfunction. This leads to mutations which become a new...
Activities
Evaluation of Climate Change Model Answers. ()
The nature of the scientific method is that a hypothesis should be supported by a plausible explanation and data, from an experiment which is repeatable by other researchers, then peer reviewed. This...
Activities
Anthropogenic CO2 increases (2025)
Two short videos introduce this lesson. David Suzuki gives a simple outline of the process of climate change due to an enhanced greenhouse effect and the second illustrates the complexity of the models...
eBook
D4.3 Climate change - student friendly summary
Blue text shows extra clarification or guidance. Guiding questions SL and HL D4.3.1 - Anthropogenic increases in atmospheric concentrations of carbon dioxide and methane are causes of climate change...
Activities
Enhanced Greenhouse Effect (2025)
Beginning with a short introduction / recap of the greenhouse effect, this simple experiment illustrates the principles of the greenhouse effect. Heating beakers of gases using sunlight or even bright...
Activities
Read about Proteasomes and protein recycling
Protein breakdown is just as essential to the cell as protein synthesis. Four uses of the proteasome There are two major structures in cells which break down and recycle damaged or unneeded proteins.They...