How many polypeptide chains are shown in the tertiary protein structure in Model 3?

Here, we are required to determine how many polypeptide chains are shown in the tertiary protein structure in Model 3 as shown in the picture attached.

The tertiary protein structure in Model 3 has 1 polypeptide chain/backbone.

Protein tertiary structure is simply defined the three dimensional shape of a protein. By convention, the tertiary structure (TS) of a protein will have a single polypeptide chain otherwise known as the polypeptide backbone with one or more protein secondary structures as the case may be. However, amino acid side chains may interact and bond in a variety of ways as evident in the diagram given.

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3

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