LIFE SCIENCE

Detailed explanation-1: -Every protein at least contains a primary, secondary, and tertiary structure. Only some proteins have a quaternary structure as well. The primary structure is comprised of a linear chain of amino acids.

Detailed explanation-2: -The complete structure of a protein can be described at four different levels of complexity: primary, secondary, tertiary, and quaternary structure.

Detailed explanation-3: -Protein primary structure is the linear sequence of amino acids in a peptide or protein. By convention, the primary structure of a protein is reported starting from the amino-terminal (N) end to the carboxyl-terminal (C) end. Protein biosynthesis is most commonly performed by ribosomes in cells.