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The cellular membrane is most important for maintaining homeostasis within a cell, but this is not an organelle.
The RER is a rather large organelle and it is next to the nuclear membrane and the cellular membrane.
Most cellular organelles have membranes. Mitochondria, chloroplasts and nucleus are special among those because they have double membranes instead of single.
The cellular membrane or plasma membrane. (same thing) If plants then it is cell wall.
A cell wall is not an organelle, a cell wall is biologically a extracellular. "Extra"cellular is just an extra cellular part of the cell that surrounds it.
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A membrane-bound organelle is an organelle surrounded by a plasma membrane.
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