The sequence in which amino acids are arranged in a protein is called its
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → Primary structure
NCERT (2026-27 edition):
10.2.3 Structure of Proteins – “(i) Primary structure of proteins: Proteins may have one or more polypeptide chains. Each polypeptide in a protein has amino acids linked with each other in a specific sequence and it is this sequence of amino acids that is said to be the primary structure of that protein.”