Question

Which of the following structure of proteins represents its constitution?

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

Hint:

The primary structure of proteins is their amino acid sequence, which determines the protein's higher-level structures, such as secondary, tertiary, and quaternary.

Answer 1

The Correct Option is C

The primary structure of a protein refers to the unique sequence of amino acids in a polypeptide chain. This sequence dictates the protein's higher-level structures (secondary, tertiary, and quaternary). 
Step 1: The primary structure of a protein is the most fundamental level of organization, representing its constitution in terms of amino acid sequence. 
Step 2: Secondary structure refers to local folded structures that form within a polypeptide chain, such as alpha helices and beta sheets. Tertiary structure refers to the overall three-dimensional shape of the protein, while quaternary structure refers to the arrangement of multiple polypeptide chains. Thus, the correct answer is Primary structure, as it represents the constitution of the protein.