If a chain consists of two joined amino acids it is called a dipeptide; three joined amino acids form a tripeptide; more than 10 amino acids joined together is called a polypeptide; and a polypeptide chain that contains 50 or more amino acids is called a protein.

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A dipeptide is formed from two amino acids, a tripeptide from three, a polypeptide is a chain of more than 10 amino acids, and a protein is typically defined as a polypeptide chain that contains 50 or more amino acids.

If a Chain Consists of Two Joined Amino Acids It