A protein that no longer functions because its shape has changed (e. g., as a result of heating) has been .

denatured

Explanation:

To denature a proteins means to subject the protein to a condition that makes the protein to stop functioning as usual. This is usually due to a permanent change in the structure or shape of the protein. A protein may be denatured by change in pH, heat of binding of other molecules to the protein molecule.

i think the answer is terrae but not 100 percent sure. ▓▬▬ §