What are the four stages of protein structures?

Answer 1

The four levels of protein structure are differentiated from each other by the complexity of their polypeptide chain. Proteins are constructed from 20 amino acids. The levels are the hydrogen atom, a Carboxyl group, an amino group and a variable or "R" group. They have a primary structure, the order in which the amino acids are linked to form a protein. Secondary structure , coiling and folding of the polypeptide chain. Tertiary structure, is a 3-D structure of a protein chain. Quaternary is the structure of a protein macro molecule formed by interactions between several polypeptide chains..

Answer 2

• Primary structure: the linear arrangment of amino acids in a protein and the location of covalent linkages such as disulfide bonds between amino acids.
• Secondary structure: areas of folding or coiling within a protein; examples include alpha helices and pleated sheets, which are stabilized by hydrogen bonding.
• Tertiary structure: the final three-dimensional structure of a protein, which results from a large number of non-covalent interactions between amino acids.
• Quaternary structure: non-covalent interactions that bind multiple polypeptides into a single, larger protein. Hemoglobin has quaternary structure due to association of two alpha globin and two beta globin polyproteins.

Answer 3

primary, secondary, tertiary, and quartenary