Question
The primary structure of a protein refers to:
A. Linear structure and order of the amino acids present
B. Regular confirmational forms of a protein
C. Complete three-dimensional structure of the polypeptide units of a given protein
D. Subunit structure of the protein
Show Answer
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Correct Answer » A
Explanation
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Ans ‘A’ . Linear structure and order of amino acids present
The modular nature of protein synthesis and folding are embodied in the concept of orders of protein structure:
- Primary structure—the sequence of amino acids in a polypeptide chain.
- Secondary structure—the folding of short (3-30 residue), contiguous segments of the polypeptide into geometrically ordered units.
- Tertiary structure—the assembly of secondary structural units into larger functional units such as the mature polypeptide and its component domains.
- Quaternary structure—the number and types of polypeptide units of oligomeric proteins and their spatial arrangement.
