Question

why proteins are called tertiary source of energy​

Answer 1

The tertiary structure will have a single polypeptide chain "backbone" with one or more protein secondary structures, the protein domains. Amino acid side chains may interact and bond in a number of ways. The interactions and bonds of side chains within a particular protein determine its tertiary structure.

Answer 2

Explanation:

unlike carbohydrate or fact which can provide us with energy protein topically are used to build parts of the cell in other words they are some of the raw materials the cell needs to make cells and tissues when an excess of protein in it and the extra protein can be broken down into energy yielding compounds.