http://img209.imageshack.us/img209/7596/mbiolq1.jpg [Broken] Hi PF, any help with parts a, b and c would be most appreciated. I haven't had a go at these simply because I don't know where to start. There are parts d) etc. onwards that I have done already; it seems to be the simple stuff I struggle with! The question comes from a past paper for an exam I am revising for and the exam is on Wednesday so I'm desperate! Ha ha, thanks in advance!