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The question of are proteins made of peptides delves into the fundamental architecture of biological molecules. At their core, both peptides and proteins share the same foundational elements: amino acids. These amino acids are the building blocks of proteins and are linked together by chemical bonds known as peptide bonds. This shared origin often leads to confusion, but understanding the distinctions is crucial for comprehending their diverse roles in the body.

Essentially, proteins are made from peptides, or more precisely, from long chains of amino acids linked by these characteristic peptide bonds. The primary difference between a peptide and a protein lies in their size and complexity. Peptides are short chains of amino acids, typically ranging from 2 to 50 amino acids. Chains of fewer than twenty amino acids are often referred to as oligopeptides. These shorter chains are considered peptides.

Conversely, proteins are formed from one or more polypeptides joined together. A polypeptide is a longer chain of amino acids. When these chains become sufficiently long and fold into specific three-dimensional structures, they are classified as proteins. A common, though somewhat arbitrary, benchmark used to differentiate is molecular mass; polypeptides that have a molecular mass of 10,000 Da or more are called proteins. Another guideline suggests that chains of more than 20-30 residues are rarely considered proteins and are commonly referred to as polypeptides. Therefore, proteins are essentially very large peptides, or more accurately, composed of one or more lengthy polypeptide chains. Long molecules made up of multiple peptide subunits constitute a protein.

The sequence of amino acids in a peptide or protein, and the order in which they are joined by peptide bonds, is referred to as the primary structure. This sequence dictates the subsequent folding and the ultimate function of the molecule. While peptides themselves can have biological activity, proteins are naturally occurring large molecules that perform a vast array of complex functions within living organisms. They are instrumental in everything from enzymatic reactions and structural support to immune responses and signal transduction. Proteins are polypeptides long and complex enough to form folded three-dimensional structures and perform more sophisticated functions than shorter peptides.

The biochemical reaction that forms a peptide bond involves a condensation reaction between the carboxyl group of one amino acid and the amino group of another, releasing a molecule of water. This process is fundamental to how proteins are made. Within a protein, multiple amino acids are linked together by peptide bonds, thereby forming these long chains.

It's important to note that while the distinction is often based on length, both peptides and proteins are vital. Peptides are increasingly recognized for their therapeutic potential, with applications in areas like wellness and even as candidates for the prevention and treatment of various conditions. They are made by biological processes and can exert significant physiological effects.

In summary, the answer to are proteins made of peptides is a resounding yes, with the understanding that proteins are comprised of long chains of amino acids (polypeptides), and these chains are fundamentally extended peptides. They are two types of structures composed of amino acids, with size and structural complexity being the key differentiators. Both play indispensable roles in maintaining life.