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region of nucleus where ribosomes are assembled, not membrane-bound, formed from a loop of DNA with multiple tandem copies of rRNA genes
clear, gelatinous fluid in cells that is the site of numerous chemical reactions; in eukaryotic cells, it suspends the cell's organelles
powerhouse of the cell, produces energy (ATP) from oxygen and sugar(Cellular respiration)
a cell organelle that helps make and package materials to be transported out of the cell
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