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Multiple Choice
Which of the following could be classified as a prosthetic group?
A
I only
B
I, III, IV
C
II only
D
II, IV
E
None of the above
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Verified step by step guidance
1
Understand the definition of a prosthetic group: A prosthetic group is a non-polypeptide unit that is tightly and permanently attached to a protein and is required for the biological activity of the protein.
Analyze the given options: Glycine (I) is an amino acid, Copper (IV) ion (II) is a metal ion, α-helix (III) is a secondary structure of proteins, and Ubiquinone (IV) is a coenzyme.
Determine which options can be prosthetic groups: Metal ions like Copper (II) can act as prosthetic groups in metalloproteins. Ubiquinone (IV) can also act as a prosthetic group as it is involved in electron transport chains.
Eliminate options that cannot be prosthetic groups: Glycine (I) is an amino acid and part of the protein structure itself, not a separate non-polypeptide unit. The α-helix (III) is a structural motif within proteins, not a separate entity.
Conclude that the correct options are II and IV, as they can function as prosthetic groups in biological systems.