Therefore this gives us many varying ways to form proteins, depending on the types, order, and number of amino acids in the chain. When protein is being formed, it is not conditional for the combination to occur among similar amino acids.
The combination of two amino acids is called a dipeptide compound, and the protein chain formed of several amino acids is called a polypeptide. Take a look figure 15: you can observe that these bonds are present between the carboxyl group of an amino acid with an amino group of another amino acid, with the removal of water. Proteins are made up of repeated units of amino acids which link with each other via peptide bonds. Amino acids are made up of a basic group (amino group NH 2), an acidic group (carboxyl group COOH), a hydrogen atom, and a terminal group R which differs from one amino acid to another. They are organic compounds made up of hydrogen, oxygen, carbon and nitrogen atoms. Amino acids are the protein’s building units. They have high molecular weight and are made up of structural units (monomers) called amino acids. Proteins are complex macromolecules (polymers). Proteins contribute to the biochemical processes that preserve life. All living organisms, from the biggest animal to the most microscopic organisms, are mainly made up of proteins. Proteins represent the structural composition of all living organisms. Keep reading for more detailed A-level Biology revision! Protein structure refers to the three-dimensional arrangement of amino acid residues in a polypeptide chain, including the primary, secondary, tertiary, and quaternary structures, which collectively determine the protein’s function and biological activity. Which structural level is present in fibrous proteins?. What are the two main types of proteins on the basis of structure?. 
What are the structural levels of proteins?.
What is the structural unit of proteins?.
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