Oh god..I stuffed up that antigen question, I had to guess it. I think I wrote Th cells lol. And I left the final part of the 1st short answer (something about a feature of a fibrous protein and how the arrangement of chains gives that feature) blank because I forgot absolutely everything I learned about that! It was only 1 mark so I suppose it's not the end of the world for me lol :S ...I put collagen for a fibrous protein, and said that its key function is that it gives strength and elasticity to skin. My friend and I came out freaking about our hormone definitions...ours were basically identical to the one they gave on the paper! My biology teacher said the paper was very easy, so they're going to mark it hard. I was actually expecting a hard paper, but even last year's was marginally harder than this one.