Error | Ulož.toEukaryotic microorganisms possess membrane-bound cell organelles and include fungi and protists , whereas prokaryotic organisms—all of which are microorganisms—are conventionally classified as lacking membrane-bound organelles and include Bacteria and Archaea. Viruses have been variably classified as organisms,  as they have been considered either as very simple microorganisms or very complex molecules. Prions , never considered as microorganisms, have been investigated by virologists, however, as the clinical effects traced to them were originally presumed due to chronic viral infections, and virologists took search—discovering "infectious proteins". The existence of microorganisms was predicted many centuries before they were first observed, for example by the Jains in India and by Marcus Terentius Varro in ancient Rome. The first recorded microscope observation was of the fruiting bodies of moulds, by Robert Hooke in , but the Jesuit priest Athanasius Kircher was likely the first to see microbes, which he mentioned observing in milk and putrid material in Antonie van Leeuwenhoek is considered a father of microbiology as he observed and experimented with microscopic organisms in , using simple microscopes of his own design.
Introduction To Microbiology
B viruses. C prokaryotic cells. D eukaryotic cells. B genes. C RNA segments.
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