Q. The haemoglobin of a human foetus
A) Has a higher affinity for oxygen than that of an adult
B) Has a lower affinity for oxygen than that of the adult
C) Its affinity for oxygen is the same as that of an adult
D) Has only 2 protein subunits instead of 4
Explanation
[Solution from source] Foetal haemoglobin (α₂γ₂) binds O₂ more strongly than adult HbA, so it can take oxygen from maternal blood across the placenta. It is still a tetramer of four globin chains, not two. Answer (1).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.