Haemoglobin, a globular protein, consists of four polypeptide chains, two alpha chains and two beta chains. In normal individuals, in the DNA which codes for each beta chain, the sixth triplet has a code for glutamic acid.
In individuals with sickle cell anaemia this base triplet mutates and codes for valine.
What does this mutation change in the haemoglobin molecule?
1 )
the iron content
the primary structure
3 )
the quaternary structure
4 )
the secondary structure
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