Question

which membrane encloses the nucleus of an eukaryotic cell? a nuclear envelope b nuclear pore c nucleolus d endoplasmic reticulum

Explanation:

The nuclear envelope is a double - membrane structure that surrounds the nucleus in eukaryotic cells. It separates the nucleus from the cytoplasm. A nuclear pore is a channel in the nuclear envelope for transport. The nucleolus is inside the nucleus and is involved in ribosome synthesis. The endoplasmic reticulum is a separate organelle (either rough or smooth) involved in protein and lipid synthesis.

Answer:

A. nuclear envelope