Haemoglobin consists of two α chains and two β chains. Approximately 5% of all humans have one amino acid in the β chain that has been changed, affecting the structure and stability of haemoglobin.
Which of the levels of protein structure could be changed in the haemoglobin of these humans?
1 )
primary only
2 )
primary and quaternary only
primary, secondary, tertiary and quaternary
4 )
secondary, tertiary and quaternary only
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