Answer:
Tertiary.
Explanation:
Primary structure of proteins refers to the order of amino acids that make up the protein. The heme is an nonprotein non-amino acid, so it is not involved at this stage.
Tertiary structure of proteins is the overall 3-D folding of the protein (it comes after secondary, which involves folding into a repeated pattern). The heme bonds to its correct position on the hemoglobin during this stage and helps in correct folding.
Essential amino acids are those amino acids which are not synthesized by our body. They are supplied through the food we eat. If a person is not getting the required essential amino acids in the body, it will affect both physical and mental health. In the absence of essential amino acid body breaks down muscle tissue to get the required amino acid, therefore muscle wasting is the first symptom of the deficiency of essential amino acids. Low level of essential amino acid may cause high anxiety.
The main advantage of monomers or basic subunits of macromolecules is their simplicity. The simple monomeric subunits from which all proteinsnucleic acids, fats and carbohydratesare constructed are few in number and identical in all living species.These simple monomerc units can be linked in many different combinations (different covalent bonds) to produce complex biological polymers with different functions.
