Hydrophobic interactions help to stabilize the structure(s) of a protein. a. primary
b. secondary
c. secondary and tertiary
d. tertiary and quaternary
e. secondary and quaternary

d. tertiary and quaternary

Explanation:

Form or shape of protein can be understood by its structure. The structure of protein encompasses four levels of protein :

Hydrophobic Interactions refers to amino acids with non polar r group structure together on inside of protein, which leaves Hydrophobic amino acids outside to interact with surrounding water molecules.

These help to stabilise : D) Tertiary & Quaternary protein structures.

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