Which of the following statements best descri | vedclass

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(B) The quaternary structure of a protein refers to the spatial arrangement and interaction of two or more polypeptide chains (subunits) that function

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The structure formed by the assembly of multiple polypeptide chains through various bonds including disulfide bridges.

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(B) The quaternary structure of a protein refers to the spatial arrangement and interaction of two or more polypeptide chains (subunits) that function as a single protein complex.These subunits are held together by non-covalent interactions such as hydrogen bonds,ionic bonds,hydrophobic interactions,and sometimes covalent disulfide bridges.Option $A$ describes secondary structure (alpha-helix).Option $C$ describes primary structure.Option $D$ describes fibrous proteins which often exhibit secondary structure.Therefore,the correct description of quaternary structure is the assembly of multiple polypeptide chains.

Which of the following statements best describes a protein with quaternary structure?

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