Ubiquitin-Mediated Protein Degradation Is a Complex Process, and Many of the Signals

Multiple Choice

Ubiquitin-mediated protein degradation is a complex process, and many of the signals remain unknown. One known signal involves recognition of amino acids in a processed protein that are either stabilizing (Ala, Gly, Met, Ser, etc.) or destabilizing (Arg, Asp, Leu, Lys, Phe, etc.) and are located at:

A) a helix-turn-helix motif in the protein.
B) a lysine-containing target sequence in the protein.
C) a zinc finger structure in the protein.
D) the amino-terminus of the protein.
E) the carboxy-terminus of the protein.