Final answer:
N-glycanase and DUBs function by catalyzing the removal of N-linked glycans from glycoproteins and removing ubiquitin from proteins, respectively.
Step-by-step explanation:
The function of N-glycanase and deubiquitinating enzymes (DUBs) is to catalyze the removal of N-linked glycans and to remove ubiquitin from proteins, respectively. N-glycanase removes N-linked glycosylation, a post-translational modification where complex sugars are added to proteins within the endoplasmic reticulum (ER) and the Golgi apparatus. These glycans play crucial roles in protein folding and stability. On the other hand, DUBs help to regulate protein degradation by removing ubiquitin chains; ubiquitin is a small protein that can be attached to proteins to signal them for degradation by the proteasome. The correct answer to the student's question is B) Catalyze removal of N-linked glycans for N-glycanase and relatedly, DUBs would facilitate the reversal of ubiquitin chain assembly though it is not an option listed.