A polypeptide can be called as protein when its mass is

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Peptides containing more than 10   u amino acids are called polypeptides. Polypeptides are formed by the linear sequence of amino acids. Some proteins are composed of two or more poly peptide chains. Relatively shorter peptides are known as oligo peptides whereas longer polymers are called polypeptides. Polypeptides containing more than 100   u amino acids having molecular mass higher than 10 , 000   u are generally called as proteins. However, the distinctive between a polypeptide and a protein is n