Question

The polypeptide chain in a protein has amino acids linked with each other in a specific sequence. This specific sequence of amino acids is called :

• A. Primary structure of protein
• B. Secondary structure of protein
• C. Tertiary structure of protein
• D. Quaternary structure of protein

Hint:

The primary structure is held together by covalent peptide bonds.
The sequence is determined by the genetic code in DNA.
The secondary structure is stabilized by hydrogen bonding between the backbone atoms.

Answer 1

The Correct Option is A

Concept:

• Protein structure is organized into four hierarchical levels: primary, secondary, tertiary, and quaternary.

• Each level describes a different aspect of the spatial arrangement of the atoms in the protein.
Step 1: Defining the levels of structure
1. Primary structure: Refers to the unique, linear sequence of amino acids in a polypeptide chain. Any change in this sequence results in a different protein.
2. Secondary structure: Refers to local folding patterns like \( \alpha \)-helices and \( \beta \)-pleated sheets held by hydrogen bonds.
3. Tertiary structure: Refers to the overall three-dimensional shape of a single polypeptide chain.
4. Quaternary structure: Refers to the spatial arrangement and interaction of multiple polypeptide subunits.

Step 2: Conclusion
Since the question specifically asks for the "specific sequence of amino acids," it corresponds to the primary structure.