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Proteins are polymers of amino acids held together by peptide bonds. Proteins are polymers that are made from amino acid monomers. The primary structure of a protein refers to the sequence of amino acids in the polypeptide chain. This structure is held together by peptide bonds that are made during the process of protein biosynthesis. 

Proteins are made up of amino acids that held together by covalent bonds.

What type of bond present between amino acid molecules?

A protein molecule is made of amino acids. Two amino acids are held together by covalent peptide bond that's why Proteins are also known as polypeptides.

So we can conclude that Proteins are made up of amino acids that held together by covalent bonds.

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