Nuclear membrane

Definition

The nuclear membrane is a double-layered structure that encloses the nucleus in eukaryotic cells, separating it from the cytoplasm. It controls the flow of substances in and out of the nucleus.

5 Must Know Facts For Your Next Test

1. The nuclear membrane consists of two lipid bilayers: an outer membrane and an inner membrane.
2. Nuclear pores, which are large protein complexes, span the nuclear membrane to regulate the exchange of materials between the nucleus and cytoplasm.
3. The space between the inner and outer membranes is called the perinuclear space.
4. The outer membrane is continuous with the endoplasmic reticulum (ER), allowing for direct communication between these two structures.
5. During cell division, the nuclear membrane disassembles and reassembles, ensuring proper segregation of genetic material.

Review Questions

Related terms

Cytoplasm:

The gel-like substance inside a cell that surrounds organelles and is enclosed by the cell membrane.

Endoplasmic Reticulum (ER):

A network of membranous tubules within eukaryotic cells involved in protein and lipid synthesis.

Nucleus:

The organelle in eukaryotic cells that contains most of the cell's genetic material.