Domains of Life; Prokaryotic vs. Eukaryotic Cells

ID #1489

Prokaryotes are surrounded by a cytoplasmic membrane. Then, are all of the parts in eukaryotes (like mitochondrion, lysosome) surrounded by the cytoplasmic membrane too? Or are they just surrounded by one cytoplasmic membrane?

Each of the organelles in a eukaryotic cell is separated from the cytoplasm by a biological membrane, but those membranes would not be called cytoplasmic membranes.  That phrase is reserved to specifically refer to the biological membrane that separates the cytoplasm from the outside world.  So there are actually separate mitochondrial membranes, and a lysosomal membrane, ER membranes, and so forth.  As we'll see soon, they're all made of essentially the same material, with some notable differences.

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