Personally I'd recommend looking and learning through mark scheme answers to see how they want you to word a particular answer and then apply those to the different questions they ask.
So for enzymes, I do OCR A, and I know for a fact that a mark will come for saying 'the substrate shape is complementary to that of the active site of the enzyme, and thus an Enzyme substrate complex can form.' However, I know I have to word it like that specifically, because that is always how its written in the mark scheme.
Biology is all about application of knowledge, so when I get a question, I always look for connections with other topics ( usually some of the questions are actually worded in a way to hint that they want you to combine knowledge from multiple topics). Obviously it won't be explicit, but once you see it, you'll realise how the question is guided to use knowledge from more than one topic.