Question

How are proteins different from polypeptides?

Answer 1

A peptide is at least two amino acids consolidated by peptide bonds, and a polypeptide is a chain of numerous amino acids. A protein contains at least one polypeptide. In this manner, proteins are long chains of amino acids held together by peptide bonds.

Complete answer:
Proteins and peptides are essential components of cells that perform critical biological functions. Proteins, for example, shape cells and respond to signals transmitted from the extracellular environment. Certain peptides play important roles in regulating the activities of other molecules. Proteins and peptides are structurally very similar, both consisting of chains of amino acids that are held together by peptide bonds (also called amide bonds).

Proteins	Polypeptides
A protein is a complex structure made out of a large number of amino acids.	A polypeptide is a long unbranched chain made out of amino acids.
formed from polypeptides.	Formed from amino acids.
molecular weight is a lower than that of a polypeptide.	Molecular weight is lower than of a protein.
Compound of several types of bonds such as peptide bonds, disulfide bonds,ionic bonds and Van Der Waal attractions.	Composed of polypeptide bonds.

Note: A peptide is two or more amino acids joined together by peptide bonds; a polypeptide is a chain of many amino acids; and a protein contains one or more polypeptides. Proteins are thus long chains of amino acids held together by peptide bonds.