tubes yes, I absolutely agree with that! I was just trying to keep it as simple as possible haha. But yes, the induced fit model and lock and key model do slightly differ. The induced fit model does state that through the conformation change, the enzyme creates a chemical environment in the active site that is required for the reaction to proceed. It's important to note that that the way enzymes go about this can differ with the induced fit model. Some will speed up chemical reactions by bringing the substrate together in the right orientation. Some will alter the chemicals inside the active site to favour the reaction (e.g. polarity or pH). The substrate molecules can sometimes be bent to facilitate bond-breaking as well, etc. etc. After the reaction has occurred, the enzyme returns to its original state (unlike the "lock and key" model that states that there are no active site changes/conformation changes and that the substrate binds to it perfectly). However, the basic principles are still similar between both models; enzymes bind to reactant molecules and hold them in such a way that chemical-bond breaking and forming can occur more quickly, weakening the intramolecular forces holding the substrate together and bringing it/them into a state where a reaction is more favourable. Obviously, the process is much more complex, but from what my bio teacher has told me, these are the main principles to understand (also, VCE chem is much more detailed, as the chemistry behind how enzymes lower activation energy and reactions rates/catalysts are discussed in more depth, whereas this is not as prominent in the VCE bio study design from what I've been told -> It's the principles that are key!).
