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A ( cell membrane, cytoplasm, eukaryotic cell, nucleus ) is a protective covering that encloses the entire cell. ( Cytoplasm, Cell membrane, Organelle, Nucleus ) is the gelatin-like material inside of the cell. A ( nucleus, cell membrane, cell wall, cytoplasm ) is a structure enclosed by its own membrane. An ( organelle, nucleus, cytoplasm, prokaryotic ) is any part of the cell that is enclosed by a membrane.