I said that too much present in the cell could cause cell poisoning and dysfunction.
I said something very similar to that, but I also added that too little copper could adversely the fly's functioning as well.
Yer i was really pleased with them! (have to admit i nearly tripped up on that 2nd question too!)
I don't think you are actually able to innoculate an organism with rheumatiod arthritus or expose it to it (it's not communicable obviously) so the rats must have been prone to it already! also, vitamin D wouldn't be able to prevent the virus from progressing... or at least i woulndt expect so!
but that's just me trying to make myself (and anyone else) feel better 
that's exactly what i thought!
I doubt vitamin D would have been able to cure the disease altogether, and i'm more than 100% sure that it said that the virus was CAUSED by the lack of vitamin D, and that is the theory I believe they would be testing, and well you cant test for a cause of a disease if all the subjects already have it. :S
About the copper question.
I wrote that heavy metals occupy the active sites of enzymes and hence inhibit theyre function :S. Wild guess. I was thinking of lead poisoning and yeah. It's prob wrong.
Rheumatoid arthritis isn't caused by a virus - it's an autoimmune disease that occurs largely due to genetic predisposition, but the question suggested that vitamin D deficiency could have contributed to its development. I think the wording was quite open to interpretation. As I said before, my personal interpretation of it was that it was to do with vitamin D deficiency making the disease develop at a faster rate, rather than being the cause of it. My friend and I were discussing the answer to this question with our teacher right after the exam, and he approved this interpretation...but we could all be wrong
I think your "wild guess" would probably be accepted as a correct answer, again that question was so open!
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