A) has a lower affinity for oxygen than that of the adult
B) its affinity for oxygen is the same as that of an adult
C) has only 2 protein subunits instead of 4
D) has a higher affinity for oxygen than that of an adult
Correct Answer: D
Solution :
Haemoglobin is the protein that makes red blood corpuscles red and binds easily and reversibly with oxygen. Normal values for haemoglobin are 14-20 g/100 mL of blood in infants, 13-18 g/100 mL in adult male and 12-16 g/100 mL in adult females. Haemoglobin is made up of protein globin bound to the red haem pigment. The globin consists of four polypeptide chains-2 alpha and beta. Foetal haemoglobin does not sickle even in those distined to have sickle cell anaemia, ie, haemoglobin of foetus has higher affinity of oxygen than that an adult.
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