How many O 2 molecules can bind with single molecule of Hb ?

Question

How many O 2 molecules can bind with single molecule of Hb ? (A) 8 (B) 6 (C) 4 (D) 4.5

Tardigrade Admin · Accepted Answer

Haemoglobin consists of four polypeptide chain

(2 α

and

2 β)

having heme as prosthetic group. Heme is iron

(F e^{2 +})

containing prophyrin ring. One haemoglobin binds four oxygen molecules, one per heme and form oxyhemoglobin.

H b + 4 O_{2} ⇌ H b (O_{2})_{4}

Q. How many O2​ molecules can bind with single molecule of Hb ?