Hydrogen bonding is found in what levels of protein structure?

Secondary structure

The most common types of secondary structures are the α helix and the β pleated sheet. Both structures are held in shape by hydrogen bonds, which form between the carbonyl O of one amino acid and the amino H of another.

Explanation:

Secondary structure

The most common types of secondary structures are the α helix and the β pleated sheet. Both structures are held in shape by hydrogen bonds, which form between the carbonyl O of one amino acid and the amino H of another.

2%? i tried finding the exact sorry if it's not 100% correct ; -;

if you know your abc's you should be able to get your answer or just use google