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Question

Even after disruption of all the hydrogen bonds, which structural levels of a protein molecule still remains intact?

A
Tertiary
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B
Primary
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C
Secondary
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D
Quaternary
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Solution

The correct option is B Primary
Primary structure of the protein is formed by peptide bond formation between amino acids.
The secondary structure is formed by the arrangement of primary structure into αhelices and/or βsheets.
The secondary structures then fold upon itself by forming various types of bonds such as hydrogen bonds, ionic bonds, etc. This is called the tertiary structure.
These tertiary structures then arrange themselves with the help of different types of bonds (hydrogen bonds, ionic bonds, etc.) to form subunits of the quaternary structure of protein.


Thus, after disruption of hydrogen bond, its structure will remain intact. Whereas secondary, tertiary and quaternary structure possess hydrogen bond and these bonds get disrupted.

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