What are the differences between peptide and protein?

Question

Accepted Answer

Peptide and protein are two types of structures composed of amino acids. There are several differences between the two.

Basis Of Differentiation

Peptide

Protein

Definition

Is a short chain of amino acids that are connected to one another in a sequence by a peptide bond

Is a longer chain of amino acids

Number of amino acids

May contain up to 50 or fewer amino acids

May contain more than 50 amino acids

Types of amino acids

Is composed of essential amino acids as well as other naturally-occurring amino acids

Is composed of 20 essential amino acids

Structure

Is a simple structure that is made up of a polypeptide backbone to which are attached the amino-acids specific side chains, the R group

Is a complex molecule made up of one or more polypeptide chains folding into secondary, tertiary or quaternary structure, which is held stable by 3 types of weak non-covalent bonds – ionic bonds, hydrogen bonds, and van der Waal bonds

Composition

Composed of both essential amino acids and other naturally-occurring amino acids

Composed only of 20 essential amino acids

Function

Plays a key role in regulating activities of other molecules, particularly proteins

Serves as enzymes, structural molecules, and hormones

Basis Of Differentiation	Peptide	Protein
Definition	Is a short chain of amino acids that are connected to one another in a sequence by a peptide bond	Is a longer chain of amino acids
Number of amino acids	May contain up to 50 or fewer amino acids	May contain more than 50 amino acids
Types of amino acids	Is composed of essential amino acids as well as other naturally-occurring amino acids	Is composed of 20 essential amino acids
Structure	Is a simple structure that is made up of a polypeptide backbone to which are attached the amino-acids specific side chains, the R group	Is a complex molecule made up of one or more polypeptide chains folding into secondary, tertiary or quaternary structure, which is held stable by 3 types of weak non-covalent bonds – ionic bonds, hydrogen bonds, and van der Waal bonds
Composition	Composed of both essential amino acids and other naturally-occurring amino acids	Composed only of 20 essential amino acids
Function	Plays a key role in regulating activities of other molecules, particularly proteins	Serves as enzymes, structural molecules, and hormones

Basis Of Differentiation

Peptide

Protein

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