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Answer:

Many enzymes consist of several sub-units, often as dimers (2 sub-units) and tetramers (4 sub-units) combined in this way. Do not assume that quaternary means "composed of 4 sub-units" because haemoglobin is composed of 4 sub-units. It is the 4th level of protein structure.
Interactions among the amino acid side chains within a single protein molecule determine the protein's tertiary structure. Tertiary structure is the most important of the structural levels in determining, for example, the enzymatic activity of a protein.

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