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Mitochondria are organelles found in eukariota, i.e. compartments inside the cells, with a double lipid layer membrane and are some micrometers wide. Their number can vary a lot between species and/or tissues (from just one to several thousands). They mainly produce ATP, a molecule used in various way and especially to give energy to a lot of processes in the cells.

Ribosomes on the other hand are much smaller units, about 20-30 nm wide (that's a ~1000 times smaller), found in all living organisms so far (eukaryota, eubacteria and archea). They are complex macro-assemblies of proteins and ribosomal-RNA (rRNA) which perform the task of 'Traduction', which is to synthetise proteins from messenger-RNA (mRNA). There are thousands of them at any given time in each cell.

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14y ago

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