Why Is Ubiquitin Nicknamed the "Doom Tag

Multiple Choice

Why is ubiquitin nicknamed the "doom tag"?

A) When ubiquitin binds to a target protein, the ubiquitin enzyme degrades the protein.
B) When ubiquitin binds to a target protein, the complex is sent to the proteasome and degraded.
C) If a cell is deficient in ubiquitin, the cell will die.
D) High levels of ubiquitin in a cell cause the cell to destroy vital proteins, leading to premature cell death.
E) Ubiquitin binds to ribosomes and prevents them from translating proteins necessary for cell survival.