Which of the following are linked together to form proteins?

Vitamins are organic compounds that are essential for various metabolic processes in the body, but they are not involved in the structural formation of proteins. They serve primarily as coenzymes or precursors to coenzymes, facilitating biochemical reactions rather than forming the polypeptide chains that make up proteins.

Fats, or lipids, serve primarily as energy sources, structural components of cell membranes, and signaling molecules. While they play crucial roles in biological systems, they do not participate in the formation of proteins. Their molecular structure and functions are distinct from those of amino acids.

Monosaccharides are simple sugars that serve as energy sources and building blocks for more complex carbohydrates, such as starch and glycogen. They do not contribute to protein synthesis and are not involved in the formation of peptide bonds, making them unrelated to protein structure.