Peptides and proteins are both composed of chains of amino acids, but they differ in their length and structure.
Peptides are short chains of amino acids, typically consisting of less than 50 amino acids. They can be synthesized naturally or artificially, and some examples include hormones, neurotransmitters, and antibiotics. Peptides often have specific functions in the body, such as regulating physiological processes or acting as signaling molecules.
Proteins, on the other hand, are much larger and more complex molecules that consist of one or more polypeptide chains. They typically have a defined 3-dimensional structure, which is critical to their function. Proteins perform a wide variety of roles in the body, including catalyzing biochemical reactions, transporting molecules, and providing structural support to cells and tissues.
Overall, the main difference between peptides and proteins is their size and complexity, with peptides being smaller and simpler molecules, while proteins are larger and more complex.