Question

a sequence of amino acids, or a polypeptide, grows from the n-terminus to the c-terminus. the linear sequence of amino acids within a protein is considered the ... structure of the protein. a) tertiary b) quarternary c) primary d) secondary

Explanation:

To solve this, we recall the definitions of protein structures:

• Tertiary structure: 3D folding of a single polypeptide chain (interactions like hydrophobic, disulfide bonds).
• Quaternary structure: Assembly of multiple polypeptide chains (subunits).
• Primary structure: The linear sequence of amino acids in a protein (peptide bonds link them, grows from N - to C - terminus).
• Secondary structure: Local folding (e.g., alpha - helices, beta - sheets) due to hydrogen bonds in the polypeptide backbone.

The question asks about the linear sequence of amino acids, which matches the definition of primary structure.

Answer:

c) Primary