Primary function of amino acids in the human body

The correct answer is A. Energy storage. Amino acids primarily serve as the building blocks for proteins, which are crucial for nearly all biological processes in the human body. While they play vital roles in signal transduction (B), acting as messengers between cells, in the regulation of enzyme activity (C) by influencing the catalytic functions of enzymes, and in hormone synthesis (D), where they are components or precursors of various hormones, amino acids are not directly used for energy storage. Instead, the body primarily stores energy in the form of fats (lipids) and carbohydrates. Amino acids can be converted into glucose or fatty acids and used for energy if necessary, but their primary function is not energy storage. Which of the following is NOT a function of amino acids in the human body? A) Energy storage B) Signal transduction C) Enzyme activity regulation D) Hormone synthesis