Four heme groups, so I think four molecules of oxygen can be transported by one molecule of haemoglobin.
4 molecules of oxygen - one to each subunit on the heme
it is two main groups
There are over 30 blood groups for horses, 8 of these are major groups and 7 are recognized internationally.
There is only one normal type of red blood cell.
Sickle cell disease is one of many diseases of the red blood cell.
There are two well known types of "blood colors". The color of the blood is closely related to the oxygen molecules. O2 molecules can be bound in different ways: by the ferrous heme groups of the globins (e.g., myoglobin and hemoglobin); or by two Cu+ ions held in close proximity by six His side chains in hemocyanins. Fe2+ and Cu+ ions and ferrous heme groups free in solution do not bind reversibly; instead, they oxidized to the Fe3+ and Cu2+ forms. Under these circumstances, when Fe2+ is oxidized to Fe3+ acquires a red color, this is the reason why blood is red in upper organisms, those that have hemoglobin. On the other hand, when Cu+ oxidizes to Cu2+ turns to blueish color. In lower organisms (e.g., crustacea) the blood turns blueish when is exposed to oxygen. In resume, we have two blood colors, red and blueish, when it's oxidized.
There is only one normal type of red blood cell.
The heme "assembly line" is an eight-step process, requiring eight different and properly functioning enzymes.
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there are two layers inner and outer layer of a blood cell.......
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