The overall folding of a single protein subunit is called: a. primary structure b. secondary structure c. tertiary structure d. quaternary structure e. All of these

c) Tertiary structure

Explanation:

Tertiary structure is the three-dimensional structure that is created through side chains link and folding of nucleic acid or protein. This structure contains single chain of connected polypeptide.This helps in task performance of structure level.

Other options are incorrect because secondary structure ,quaternary structure and primary structure do no represent protein sub-unit. Thus, the correct option is option(c).  

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