Question

The correct statement in respect of protein haemoglobin is that it

• A. functions as a catalyst for biological reactions
• B. maintains blood sugar level
• C. act as an oxygen carrier in the blood
• D. forms antibodies and offers resistance to diseases

Answer 1

Answer: (C)

act as an oxygen carrier in the blood

Answer 2

Haemoglobin acts as oxygen carrier in the blood because four $Fe^{2+}$ ions of each haemoglobin can bind with four molecules of $O_2$ and form oxyhaemoglobin $4Hb+4O_2\longrightarrow Hb_4 O_8$ $\, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \,$

Oxy -haemoglobin