Defective proteins are degraded after attaching covalently to -: (A) Clathrin, (B) Pepsin, (C) Laminin, (D) Ubiquitin
Answer is D. 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.