Activities
Seals in water - model answers
These are suggested model answers for the activity Seals in water and air student sheet on the page Aquatic habitats (2025)As model answers they don't cover all the possible options for correct responses,...
ATL in Biology
Meristems and Growth.
What is a meristem and how is it that a plant can keep growing for the whole of its life? Micropropagation using the plant meristems as a source of undifferentiated cells has become an important method...
Activities
Peptide bond formation - model answers (2025)
Two amino acids form a dipeptide. The carboxyl group of one amino acid reacts with the amine group of another amino acid. A water molecule is eliminated in a condensation reaction. A peptide bond is formed...
Activities
Carbon based IB style qns - Model answers.
The document below shows some suggestions for answers to the questions IB Style Questions on carbon based compounds on the page Carbon based compounds. Of course there are other possible answers and...
Activities
Calorimetry experiment.
A great simple experiment to illustrate the energy content of these two organic molecules used for energy storage. Students carry out a calorific test on lipids and carbohydrates. They use visualisations...
Activities
Carbon based compounds.
Beginning with a quick review of the terms; element, atom, molecule and ion this lesson answers these questions. What is so special about carbon and why is it found in the molecules in living things?...
ATL in Biology
DNA Replication for HL Students
In this lesson students explore the extra details require in the explanation of DNA replication for HL students. This includes the functions of four extra enzymes and the concepts of leading and lagging...
Activities
Complementary base pairing - model answers
The document below shows model answers to the questions on the IB Style questions on complementary base pairing in DNA and RNA found on the page Extracting DNA Experiment (2025) Teachers can control...
Activities
DNA for information storage (2025)
Storing the instructions to make an organism in every cell would be a huge waste of resources if the DNA molecule was not such a good information storage molecule. This activity takes a step back from...
Activities
Extracting DNA Experiment (2025)
DNA (Deoxyribonucleic acid) is the genetic material of all organisms, DNA is universal. We find the same genes performing the same functions in all species living on Earth. Since all living things contain...