The major pathway for molecules to pass into and out of the nucleus is through
A) gap junctions between the nuclear envelope membranes.
B) porin channels in the nuclear envelope membranes.
C) nuclear pore complexes.
D) diffusion through the membrane bilayers of the nuclear envelope.

Question

Quizplus · Accepted Answer

Nuclear pore complexes allow for selective transport of molecules, including proteins, RNA, and signaling molecules, between the nucleus and cytoplasm. While some small molecules can diffuse across the nuclear envelope, the vast majority of molecules require passage through the nuclear pore complexes. Gap junctions are found between adjacent cells and are not present in the nuclear envelope, and porin channels are typically found in the outer membranes of organelles such as mitochondria, not the nuclear envelope.

The Major Pathway for Molecules to Pass into and Out