The environment is the ultimate filter for which traits are maintained by natural selection. If a trait makes it easier to live in an environment, then that trait will be maintained. If a trait is makes it difficult to live in an environment, then that trait will be discontinued or removed.
Once Oxygen reaches the blood via the lungs, it is taken in by a protein known as haemoglobin (Hb) in the red blood cells. Oxygen then binds to a heme group located within a subunit of the protein (Hb). A single heme group can bind 1 oxygen molecule, there are 4 heme groups all together meaning 4 oxygen molecules forming Oxyhaemoglobin. Oxygen is then diffused into local tissue by the Haemoglobin. - this was rushed sorry if it doesnt make alot of sense hope it helps tho
The answer is yes. Since trypanosomes do not enter cells, they are well exposed to antibodies of the immunity. They are not fully eradicated by the immune attack due to antigenic variations that enable some of its population to be unrecognized by antibodies. Keeping their surface antigen static would, therefore, improve eradication of Trypanosomiasis
The drug would be administered after infection. This is because the drug most likely works against the genes and metabolic/biological pathways of the trypanosomes responsible for their surface antigens. This would allow the immune system to easily form antibodies against the surface antigens. There would be no fear that the trypanosomes could vary their antigens hence evade the immune system.
