Question

If a protein is gently heated to break hydrogen bonds, what level(s) of structure will be unaffected, and why?

Answer 1

Answer:

Heating a protein will not change its primary structure, but may change its secondary, tertiary or quaternary structure.

Explanation is :

There are 4 levels of structure in proteins:

1) Primary Structure : the linear structure of amino acids in the polypeptide chain

2) Secondary Structure : hydrogen bonds between peptide group chains form the polypeptide chain into an alpha helix or beta-pleated sheet.

3) Tertiary Structure : interaction between side chains causes the 3-D structure of alpha helices and beta-pleated sheets to become folded into a more compact globular structure.

4) Quaternary Structure : multiple polypeptide chains coming together to form a functional unit.

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