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The correct statement in respect of protein haemoglobin is that it

1. functions as a catalyst for biological reactions
2. maintains blood sugar level
3. acts as an oxygen carrier in the blood
4. forms antibodies and offers resistance to diseases

Correct answer: acts as an oxygen carrier in the blood

Solution

Haemoglobin is a protein in red blood cells responsible for transporting oxygen from the lungs to tissues and returning carbon dioxide to the lungs.

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