Question

which of these organelles is not considered part of the endomembrane system?
lysosome
golgi apparatus
nuclear envelope
mitochondrion

Explanation:

The endomembrane system includes the nuclear envelope, endoplasmic reticulum, Golgi apparatus, lysosomes, vacuoles, and the plasma membrane. Mitochondria are not part of this system as they have their own distinct functions and are not involved in the processing, packaging, and transport of proteins and lipids like the endomembrane system components.

Answer:

Mitochondrion