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What is Defective proteins are degraded after attaching covalently to - and explain in detail?
Ans. is 'd' i.e., Ubiquitin o Defective proteins are often marked for destruction by ubiquitination (attachment of small, highly conserved protein called ubiquitin). Such proteins are rapidly degraded by proteosome, which is a macromolecular, ATP dependent, proteolytic system located in the cytosol.