What is the role of proteasomes?

• A. They inject double-stranded RNA into a cell, turning off a gene with the same sequence.
• B. They encode for products that help prevent uncontrolled cell growth.
• C. They are segments of noncoding DNA that help regulate transcription by binding certain proteins.
• D. None of the listed responses is correct.
• E. They are giant protein complexes that recognize ubiquitin and degrade the tagged proteins.