Multiple Choice
_________ involves covalent attachment of peptides leading to _________ of the target protein by ________.
7. Enzyme Inhibition and Regulation
Ubiquitination
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Which of the following statements describes one of the functions of the protein called ubiquitin?
A
Ubiquitin acts as a chaperone to assist in protein folding.
B
Ubiquitin transports oxygen in red blood cells.
C
Ubiquitin tags proteins for degradation by the proteasome.
D
Ubiquitin serves as a coenzyme in glycolysis.
Verified step by step guidance1
Understand the role of ubiquitin in cellular processes. Ubiquitin is a small regulatory protein found in almost all eukaryotic cells, and its primary function is to tag proteins for degradation.
Recall the process of protein degradation. Proteins that are damaged, misfolded, or no longer needed are marked for destruction by the attachment of ubiquitin molecules in a process called ubiquitination.
Recognize the role of the proteasome. Once a protein is tagged with ubiquitin, it is directed to the proteasome, a large protein complex that degrades and recycles the tagged protein into smaller peptides.
Eliminate incorrect options by matching the described functions to ubiquitin. For example, ubiquitin does not assist in protein folding (this is the role of chaperones), transport oxygen (this is the role of hemoglobin), or act as a coenzyme in glycolysis.
Conclude that the correct statement is: 'Ubiquitin tags proteins for degradation by the proteasome,' as this aligns with ubiquitin's well-established function in cellular protein turnover.
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