All of the following are roles of proteins except the main energy source (Option 3).
Proteins are a broad category of biomolecules that are used by cells in different physiological functions.
The most important functions of proteins include structural and enzymatic functions.
Proteins are composed of aminoacids whose breakdown and decomposition do not involve highly exothermic reactions.
In conclusion, all of the following are roles of proteins except the main energy source (Option 3).
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