A) just one molecule of oxygen
B) two molecules of oxygen
C) three molecules of oxygen
D) four molecules of oxygen
Correct Answer: D
Solution :
Haemoglobin is a complex haeme protein. Its molecule is formed of four subunits each consisting of a coiled polypeptide chain and an iron containing porphyrin ring. One molecule of haemoglobin carry four molecules of O2 during transportation.
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