Structure:
Peptides are linear chains of amino acids formed by dehydration and condensation processes. They are typically brief and contain relatively few amino acids. Proteins, on the other hand, might consist of a single polypeptide chain or several chains folded into complicated three-dimensional structures, such as secondary, tertiary, and quaternary arrangements. Proteins' various functional capacities stem from their structural complexity.
Function:
Peptides can be biologically active, such as hormones or signalling molecules, or inactive. Proteins are physiologically active and have important roles in the body, such as enzymatic activity, structural support, molecular transport, metabolic process regulation, immunological defence, and motor functions.
Peptides are essentially defined by their linear sequence of amino acids. Proteins, on the other hand, are macromolecular molecules that serve as the structural and functional basis for life. They form the body's cells and tissues and are the primary bearers of living processes. Proteins are made up of amino acids and are essential for all biological processes.
Connotation:
Peptides primarily emphasize their linear sequence of amino acids, which is their primary structure. Proteins, however, are macromolecular substances that form the structural and functional foundation of life. They constitute the cells and tissues of the body and serve as the main carriers of life activities. Proteins are built from amino acids and are closely linked to all forms of biological activity.
Presence in the Human Body:
Peptides exist in smaller amounts, often functioning as regulatory or signaling molecules. Proteins make up 16–20% of the human body's weight. For a 60 kg adult, this amounts to about 9.6–12 kg of protein, which is involved in nearly every vital process and continuously metabolized and renewed.
