Which Statement BEST Describes Prosthetic Groups

Multiple Choice

Which statement BEST describes prosthetic groups?

A) They are nonpeptide molecules or ions essential to a protein's structure.
B) They are short peptide chains attached to a larger protein.
C) They are nonfunctional components of a protein.
D) They are the active part of a protein.
E) They are the part of the protein that provides structure.