Which protein is responsible for the transport of oxygen in blood?
Correct answer: B. haemoglobin
- A. collagen
- B. haemoglobin
- C. insulin
- D. keratin
Explanation
Haemoglobin is a globular conjugated protein of four chains, each holding an iron containing haem group that binds one oxygen molecule reversibly. Collagen and keratin are fibrous structural proteins and insulin is a hormone. The variety of these roles is why protein is described as the most versatile class of biological molecule.
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About Importance of Proteins
Proteins are polymers of amino acids joined by peptide bonds, and their biological roles depend on primary, secondary, tertiary and quaternary structure. Coverage includes enzymes, hormones, antibodies, transport proteins, muscle fibres and structural tissues, together with denaturation and the effects of heat, pH and chemicals.
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