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A-Level Biology OCR A

Quaternary Structure Protein Define Describe Held Place Bonds

Quaternary structure describes the arrangement of multiple polypeptide subunits to form a functional protein complex, stabilized by similar bonds as tertiary structure.

Quaternary structure involves the association of two or more polypeptide chains to form a functional protein, stabilized by the same types of bonds found in tertiary structure.

Front Define quaternary structure of a protein and describe how it is held in place (all possible bonds).
Back Quaternary structure - association of 2 or more polypeptide chains to form a fully functional protein
  • Proteins do not have to have quaternary structure and those that do  can have identical or different subunits
  • Same bonds from tertiary are used to maintain the quaternary structure of the protein

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