Question

Which one of the following proteins is responsible for the red colour of blood?

• A. Heparin
• B. Haemoglobin
• C. Thrombin
• D. Fibrinogen

Hint:

Haemoglobin carries oxygen from lungs to tissues.

Answer 1

The Correct Option is B

Step 1: Background.
Haemoglobin is a protein present in red blood cells. It binds oxygen and contains iron.
Step 2: Explanation.
The iron in haemoglobin gives blood its characteristic red colour.
Step 3: Conclusion.
Hence, haemoglobin is responsible for red colour.