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1/ The Proteasome is a cellular organelle. Its like the recycling bin for proteins. When a cell is done with a protein, it tags it for destruction in the process called ubiquitination.
2/ The proteasome will load these tagged proteins and break them down into peptides of about 7 to 10 amino acids in length for recycling. They will further be broken down after into single amino acids for reuse to build new proteins. 
