2. The fact that the outer membrane of the nuclear envelope has bound ribosomes allows one to most reliably conclude that
(A) the nuclear envelope is physically continuous with the endoplasmic reticulum.
(B) the nuclear envelope is not part of the endomembrane system.
(C) at least some of the proteins that function in the nuclear envelope are made by the ribosomes on the nuclear envelope.
(D) nuclear pore complexes contain proteins.
(E) small vesicles from the Golgi fuse with the nuclear envelope.
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