SELECT * FROM question_mgmt as q WHERE id=1649 AND status=1 SELECT id,question_no,question,chapter FROM question_mgmt as q WHERE courseId=3 AND subId=9 AND chapterId=69 and ex_no='2' AND status=1 ORDER BY CAST(question_no AS UNSIGNED) CBSE Free NCERT Solution of 12th chemistry Biomolecules what are the common types of secondary structure o

Question:

What are the common types of secondary structure of proteins?

Answer:

There are two common types of secondary structure of proteins:

(i) ∝-helix structure

(ii) β-pleated sheet structure

∝- Helix structure:

In this structure, the -NH group of an amino acid residue forms H-bond with the group of the adjacent turn of the right-handed screw (∝-helix).

                                                

β-pleated sheet structure:

This structure is called so because it looks like the pleated folds of drapery. In this structure, all the peptide chains are stretched out to nearly the maximum extension and then laid side by side. These peptide chains are held together by intermolecular hydrogen bonds.

                       


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