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

a. primary level.

d. quaternary level.

b. secondary level.

e. All structural levels are

c. tertiary level equally affected.

I think the correct answer from the choices listed above is option A. The structural level of a protein least affected by a disruption in hydrogen bonding is the primary level. The other levels are very much affected by hydrogen bonding. Hope this answers the question.