40. Which of the following statement(s) is/are TURE about the proteins in ER?
(A) may be retained in ER.
(B) may be glycosylation.
(C) cytosolic ribosomes have proteins with N-terminal sequences that enter the ER during synthesis.
(D) may flow through to plasma membrane by C-terminal KDEL signal.
(E) may be diverted to other destinations by specific N-terminal signals.