- The primary structure of a protein refers to:
a) Linear structure and order of the amino acids present
b) Regular conformational forms of a protein
c) Complete three-dimensional structure of the polypeptide units of a given protein
d) Subunit structure of the protein
Explanation:
Primary structure: The sequence of the amino acids in polypeptide chain
Secondary structure: The folding of short (3 to 30 residues), contiguous segments of polypeptide into geometrically ordered units
Tertiary structure: The assembly of secondary structural units into larger functional units such as the mature polypeptide and its components domains;
Quaternary structure: The number and types of polypeptide units of oligomeric proteins and their spatial arrangement
Answer: Linear structure and order of the amino acids present
Ref: Harper 30th Ed. Page-