The term “holoprotein†refers to:
A protein with its prosthetic group accurately defines or describes the concept asked in this question. Within Protein Structure, precise definitions and terminology are essential for clear scientific communication. The other options (A protein without its prosthetic group, A protein composed entirely of β-sheets, and A protein composed entirely of α-helices) either describe related but distinct concepts, use incorrect terminology, or confuse similar-sounding terms that have different scientific meanings. A thorough understanding of exact definitions helps distinguish between closely related
Ref: Lehninger Principles of Biochemistry, Nelson & Cox, 8th Ed., Ch. 4
