Given what we know, we can confirm that If a single protein carries out multiple functions, then each function may be carried out by a specific region of the protein called a domain.
This is one of the many parts that make up a protein. This is what we can call the most independent parts of a protein given that they are each self-stabilizing and form their own three-dimensional structures. Each domain of a protein is considered a functional group, and therefore a single protein can carry out multiple functions.
Therefore, we can confirm that for a protein like the one described in the question, the multiple functions being carried out can be explained by the presence of the domain regions of the protein.
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