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 two protein subunits instead of four
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/100mL of blood in infants, 13-18 g/100 mL in adult maie and 12-16 g/100 mL in adult females. Haemoglobin is made up of protein globin bound to the red haeme pigment. The globin consists of four polypeptide chains-2 alpha and 2 beta. Foetal haemoglobin does not sickle even in those destined to have sickle cell anaemia, ie, haemoglobin of foetus has higher affinity of oxygen than that an adult.
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