The main queries on this site are:
1 Cytotoxic T-cells vs Killer T-cells. Many are relying on wikepedia, however I may suggest that Cardiff university may give a more VALID response
http://www.tcells.org/scientific/ clearly they are the one and the same thing, although the more commonly known natural killer cells are NOT T-cells, thay also perform he same function which is why many teachers think they are the same thing, also whilst 23% of carbon dioxide is carried by the protien haemoglobin, it is not the way CO2 is MAINLY carried, (which is as carbonic acid). Lipoprotiens is the answer, or more correcly chylomicrons as the specific type of lipoprotien. I thought the exam was overly easy. Won't separate the chaff from the hay.