The diagram shows a protein molecule.
Two long polypeptides each form α-helices for much of their length and these twist together into a
fibre.
At one end, each of these polypeptides coils into a globular head.
Two short polypeptides bind to each globular head.
What describes the protein structure of this molecule?
quaternary structure because each molecule consists of six polypeptides
2 )
secondary structure because the long polypeptides form $\alpha $-helices
3 )
tertiary structure because the $\alpha $-helices form a fibre
4 )
tertiary structure because the heads form globular proteins
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