Not a good paper, simply because the paper didn't cover the significant and more applied context such as immunity, transpiration, DNA replication or DNA translation and transcription, THE HEART in general such as coordination and initiation of the heart, cardiac cycle...
They are putting a lot of content but not testing much of it. Well, that's the key thing about Biology but it annoys me a lot.
Enzyme 6 marker was beautiful but they wanted us to cover the effect on temperature and the two enzyme mechanisms (induced fit and lock and key hypothesis) which was a bit unfair. It should have been higher than that surely.
Chi-test or whatever is called shouldn't appear in our paper, as it is for A2, but the exam board did help us with that table so I cannot really argue about that.
For the chitin question did you say that it is similar to amylose? As amylose also contains a 1-4 glycosidic bond.. Other than that I did say it s held together by glycosidic bonds and hydrogen bonding which undergoes condensation reaction and joins the monosaccharides to form a polysaccharide. It is used for energy source and storage.