In a stringed musical instrument, the part that vibrates in resonance with the sound waves produced by the strings is called the
a. reed.
b. diatonic scale.
c. sounding board.
d. membrane.

Answer;

C. Unique three-dimensional shape of the fully folded polypeptide

The tertiary structure of a protein is the unique three-dimensional shape of the fully folded polypeptide

Explanation;

A protein is a functional biological molecule that is made up of one or more polypeptides that are folded/coiled into a specific structure.

-As the secondary structure becomes established due to the primary structure, a polypeptide folds and refolds upon itself to assume a complex three-dimensional shape called the protein tertiary structure. Tertiary structure results from the interactions between the side chains (R groups) of the various amino acids.