Dear Isabel, Thanks for your comment. I have just repaired the link to the model answers page. Remember the links on the left will also give you access to the model answers. Best wishes, David
A3.2 Classification and cladistics HL - topic testThe model answers link doesn't seem to work. I click on it, and it says "This site can't be reached."
A3.2 Classification and cladistics HL - topic testCarly Good afternoon. The title is interesting, but there must be sufficient biological underpinning for a medical topic, and I am not sure how this would be achieved unlkes there is plentiful literature on hydroxyurea and HbF/other gene expression? Beware...
Extended essay - updates for 2027Hello David I would appreciate some guidance regarding a student who is planning to complete an Extended Essay in Biology. She is particularly interested in sickle cell anaemia and the promotion of HbF gene expression as a potential treatment. As...
Extended essay - updates for 2027Disregard comment - found the MS :)
Transport in plants (2025)Dear Emma, Yes of course. I've changed this today. Thanks for your comment. David
D1.1 DNA replication - student friendly summaryPlease note that the model answers for the "Guess Who?" worksheet identifies "nitrous oxide" as the cell signaling molecule type when it should say nitric oxide for #5.
Cell signalling molecules (2025)It is possible to have this available as a student task and not teacher only page? Thanks Emma
D1.1 DNA replication - student friendly summaryLucinda Interesting point. Any reasonable values can gain credit as long as the derivation is shown, it is not definitive.
Carbon cycle IB style questions - model answers (2025)
Maria
It's not possible to to select significance level in the challenge task?
Action potentials - model answers