During the development of a human, the structure of haemoglobin changes. In the developing fetus the main oxygen-carrying molecule is fetal haemoglobin. Towards the end of fetal development, fetal haemoglobin is replaced by adult forms of haemoglobin. Which of the following statements about the structure of haemoglobin are correct? 1. It is a fibrous protein 2. It has quaternary structure 3. It contains a non-protein haem group (1)

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