NDA General Ability Question (2025) — Solution

Step-by-step solution

The primary structure of a protein refers to the linear sequence of amino acids in the polypeptide chain. The amino acids are linked together by covalent peptide bonds. Secondary structure refers to local folded structures that form within a polypeptide due to interactions between atoms of the backbone, such as -helix and -pleated sheet. Tertiary structure refers to the overall three-dimensional structure of the entire polypeptide chain. Quaternary structure refers to the arrangement of multiple folded protein or coiling protein molecules in a multi-subunit complex. Therefore, a chain of peptide containing a linear sequence of amino acids linked by peptide bonds best represents the primary structure. Answer: Primary structure