Degradation of protein/ubiquitinylation /proteasomes/N-terminal ends?

Question

Degradation of proteins:

a) happens randomly

b) frequently makes use of proteasomes

c) always requires ubiquitinylation of proteins to be degraded

d) tends to target proteins with basic amino acid residues at their N-terminal ends

Answer 1

tends to target proteins with basic amino acid residues at their N-terminal ends

Answer 2

Well I know B is a good answer, because ubiquitinylation targets proteins for degradation by the proteasome.  But I can't say I recall exactly with respect to D...that might be correct too but I'm not sure.  I know A and C are false.

I know ubiquitin is added to Lysine residues which do indeed have basic side chains, but if you don't have a "both B and D" choice I don't know if I can tell you which one it's supposed to be.