Various levels of protein structureप्रोटीन संरचना के विभिन्न स्तर

NCERT Fig 9.3 · interactive diagram

Parts and their functions

• Primary structure (प्राथमिक संरचना) — Linear sequence of amino acids; first = N-terminal, last = C-terminal.
• α-helix (α-हेलिक्स) — Secondary folding like a revolving staircase; only right-handed in proteins.
• β-pleated sheet (β-प्लीटेड शीट) — Another secondary form: stretches of chain lying side by side.
• Tertiary structure (तृतीयक संरचना) — Chain folded on itself (hollow woollen ball); held by H-bonds, disulphide bonds; essential for activity.
• Quaternary structure (चतुष्क संरचना) — Arrangement of 2 or more subunits — haemoglobin: 2 α + 2 β.

Original diagram drawn by Simple Learning Hub, based on NCERT Fig 9.3. Report a mistake