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Notes:
Quaternary structure is a protein structure that is formed by multiple subunits (polypeptide chains) assembled into one functional group. Quaternary structure cannot be achieved with one polypeptide chain (as primary - tertiary can) and requires 2+ to form. They are formed due to mostly noncovalent interactions.
The subunits can be homomeric meaning they are made of the same polypeptide chains, or they can be heteromeric meaning made of different polypeptide chains.
Note: You do not need to watch this whole video! Only until about 2:30 should cover what you need to know. If you are studying for the MCAT, I would suggest reviewing the entire video.
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