What structural feature do the nucleus, mitochondria, Golgi apparatus, and endoplasmic reticulum all have in common?

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megamind-616 | Middle School Teacher | (Level 1) Associate Educator

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The nucleus, Golgi apparatus, mitochondria, and endoplasmic reticulum are all organelles in eukaryotic cells (cells that contain a nucleus). By definition, organelles are membrane-bound, meaning they are surrounded by a membrane. Thus, the common feature of the organelles within the list is that they are surrounded by a membrane. 

However, the membranes of each of the organelles are slightly different. For example, the nuclear membrane contains pores through which mRNA can travel to the cytoplasm in order for protein synthesis to occur. The mitochondria have an interior and an exterior membrane that is vital for ATP production during cellular respiration. The Golgi apparatus and endoplasmic reticulum look like mazes of membranes that are useful in the transportation and delivery of proteins and other intracellular substances.