Which of the Following Does NOT Occur During Ubiquitination Degradation

Multiple Choice

Which of the following does NOT occur during ubiquitination degradation of proteins?

A) Multiple ubiquitinations may occur on a protein substrate.
B) Ubiquitin-protein ligase (E₃) transfers ubiquitin to free amino groups on the protein.
C) E₃ selects a protein for degradation by the nature of the C-terminal amino acid.
D) Ubiquitin-carrier protein (E₂) picks up ubiquitin.