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The nucleolus is a dense, spherical structure found within the nucleus of eukaryotic cells. It is primarily involved in the synthesis and assembly of ribosomes.
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Nucleus: A membrane-bound organelle that contains genetic material (DNA) organized into chromosomes.
Ribosome: A molecular machine that synthesizes proteins by translating messenger RNA (mRNA).
rRNA (ribosomal RNA): A type of RNA that combines with proteins to form ribosomes, essential for protein synthesis.