<p>Make sure that you're up-to-date with news regarding Biochem, nelle. An admissions officer for Oxford told me that nothing will annoy an interviewer more than them asking an easy, warmup question about a related article in the news and the interviewee knowing nothing about it. The example he gave was a potential Economics student not knowing anything about the latest Budget, which had been all over the news the previous day.</p>
<p>They want passion for the subject, and often having 'a particular area of interest' will help. For example, my friend is focussing on genetics and doing extra research on that area for her interview.</p>
<p>The most important thing (or so I was told) is showing an ability to work in a tutorial. They'll probably give you some work that you're not supposed to just be able to glance at and solve. They want to see you thinking, applying skills and working through problems, and also see that you have the ability to try something that's challenging and to admit if you're not sure how to approach something. Don't just sit there and gape at the work, but ask for help if you need it.</p>
<p>Hope some of this is useful for you. :)</p>