What is the oxidation state of iron in haemoglobin?

(1)  Fe^-

(2)  Fe²⁺

(3)  Fe³⁺

(4)  Fe⁴⁺

Mature RBCs lose their ability for

Haemoglobin is

1. an oxygen carrier in human blood

2. a protein used as food supplement

3. an oxygen scavenger in root nodules

4. a plant protein with high lysine content

The transport of respiratory gases is taken care by which blood component?

1. RBC

2. WBC

3. Platelets

4. Fibrinogen

Hemoglobin in healthy individual:

1.12–20 g/10 mL of blood

2. 12–14 g/100 mL of blood

3. 12–30 g/10 mL of blood

4. 12–14 g/10 mL of blood