Why Is Ubiquitin Nicknamed the "Doom Tag

question 7

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.

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