Activities
Homeostasis & thermoregulation (2025)
Homeostasis is the maintenance of a constant internal environment of an organism. This is controlled by negative feedback loops. One example of this is thermoregulation. In this series of activities,...
Activities
Three stages of translation - model answers
The file below gives some suggestions of answers for the student question sheet in activity 1 on the page Three stages of translation - model answers....
Activities
Methylation data question - model answers
Methylation of DNA is an important epigenetic process involved in the control of cells, such as in cell development and cell differentiation. DNA methylation has also been reported to play a major role...
Activities
Sickle Cell Haemoglobin - Activity model answers
This page shows suggestions of model answers for the activity; Sickle Cell base substitution activity on the SL activities page Base substitution mutation. These are suggestions, not a mark scheme and...
Activities
Base substitution mutation (2025)
Sickle cell disease is used as an example of a base substitution mutation. Students build on the basic vocabulary and apply their understanding to an IB style question about the consequences of a base...
Activities
Transcription - extras for HL (2025)
This lesson begins with a review of the process of transcription and the role of RNA polymerase but quickly turns to the control of gene expression using nucleosomes and methylation. Experiments with...
Activities
Transcription of DNA into mRNA (2025)
Using an animated visualisation of RNA polymerase students learn how to describe the process of translation in simple terms. In order to do this a good knowledge of the structure of RNA is important....
Activities
DNA replication HL quiz - model answers (2025)
These are suggested model answers for the activity DNA replication Questions for HL on page DNA Replication for HL (2025) As model answers they don't cover all the possible options for correct responses,...
Activities
DNA Replication (2025)
DNA replication is the essence of inheritance and perhaps even the essence of life itself. It is is required for reproduction, growth and tissue replacement in multicellular organisms. At SL there are...
Activities
DNA Replication for HL (2025)
This lesson covers the extra details required from HL students in the explanation of DNA replication. This includes the functions of DNA primase, DNA polymerase I, DNA polymerase III and DNA ligase and...