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.

D. h2o + h2o > h3o + oh- confirmed.