Question

what serves as a physical barrier between the nucleus and cytoplasm? plasma membrane cell wall nuclear envelope

Explanation:

To determine the physical barrier between the nucleus and cytoplasm, we analyze each option:

• Plasma membrane: It is the cell's outer membrane, not between nucleus and cytoplasm.
• Cell wall: Present in plant/fungal cells, outside the plasma membrane, not related to nucleus - cytoplasm barrier.
• Nuclear envelope: It is a double - membrane structure that encloses the nucleus and separates it from the cytoplasm, with nuclear pores for molecular transport.

Answer:

C. nuclear envelope