Final answer:
The outer membrane of the nucleus, or nuclear envelope, is continuous with the rough endoplasmic reticulum (RER), being part of the endomembrane system that is crucial for the synthesis and transport of proteins within the cell.
Step-by-step explanation:
The outer membrane of the nucleus is continuous with the membrane of another organelle, forming part of the endomembrane system within eukaryotic cells. This connection is important because it facilitates the integration of various cellular functions such as synthesizing and transporting proteins.
The correct answer to the question is B. The endoplasmic reticulum. Specifically, the outer membrane of the nuclear envelope is continuous with the rough endoplasmic reticulum (RER). This allows for the passage of molecules between the nucleus and the endoplasmic reticulum, and is also where ribosomes can bind and produce proteins that will enter the secretory pathway. The nuclear envelope itself consists of two membranes, the outer membrane being the one that is continuous with the RER, hence forming an integrated network.
This integration is a key component of the endomembrane system, which additionally includes the Golgi apparatus, vesicles, and the plasma membrane. However, the plasma membrane is not an internal part of this system, and neither are the membranes of mitochondria or chloroplasts, which are separate organelles with different origins and functions.