the structural level of a protein least affected by disrupti

Solution

Answer is A.

The structural level of protein least affected by disruption in hydrogen bonding is the primary level.

Proteins are macromolecules and have four different levels of structure they are primary, secondary, tertiary, quaternary.

The secondary structure is a result of hydrogen bonds between the repeating units of the polypeptide chain, the third structure is a result of interactions between the side chains, the quaternary structure results from the aggregation of these polypeptide subunits.

Proteins are very sensitive molecules due to weak interactions. Proteins in most stable state can be disrupted by the number of external stress factors like temperature, Ph, removal of water, presence of hydrophobic surfaces.

The loss of secondary, tertiary, quaternary structure due to exposure to a stress factor is called denaturation, this results in the unfolding of protein into random or misfolded shape.

The secondary and tertiary structures have hydrogen bonding that give three dimensional structure to the protein, most of the proteins do not have quaternary structure.

Thus, the structural level of protein least affected by disruption in hydrogen bonding is the primary level.