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Yes, all organelles, including the nucleus, of a eukaryotic cell are contained within the cell's cytoplasm.However, the nucleus also contains its own cytoplasm, known as the nucleoplasm, which is different in composition from the cellular cytoplasm. The nucleus of a cell is found in the center, not to be confused with the nucleolus, which is inside of that. The cytoplasm surrounds the nucleus and is the fluid that c â¦ ontains the different ribosomes, etc.
Within the nucleus of a cell, the main structures are: the nucleolus, an optically dense region, sphere shaped region, which contains concentrated ribosomal RNA (rRNA) bound to proteins (there may be more than one nucleolus in a nucleus); the chromatin, made of DNA molecules released into the nuclear matrix during cell interphase; and the karyotheca, or nuclear membrane, which is the membrane that encloses the nucleus.