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JEE Main 2025 Jan 23 Shift 2, Chemistry Q3: Proteins

JEE Main2025Jan 23, Shift 2Chemistry
Q.

The - Helix and - Pleated sheet structures of protein are associated with its:

  1. A

    quaternary structure

  2. B

    primary structure

  3. C

    secondary structure

  4. D

    tertiary structure

Solution

The local folding patterns of a polypeptide chain, stabilised by hydrogen bonds between backbone NH and CO groups, define the secondary structure of a protein.

Both -helices and -pleated sheets are classic examples of these hydrogen-bonded backbone motifs, so they belong to the secondary level of protein organisation.

Concept behind this question

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