Viruses - often included with Fungi Not plants; eukaryotic...

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Viruses (Not Organisms): bacteriophage, retrovirus, HIV, polio virus, tobacco mosaic cell; virus, rhinovirus, Ebola virus Non-cellular, not alive; are molecules of DNA or RNA surrounded by like their own, need specific protein; need energy from a host cell to replicate; non-motile; don't grow nor metabolize No fossil record; may have caused malformations seen in some fossils of early organisms; probably arose as bits of DNA broken from genomes of cells Attack hosts with genomes most protein receptors to enter a presence triggers response, i.e. disease in plants, animals, bacteria, protists
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Fungi: mushrooms, truffles, rusts, smuts, molds, yeasts, rots. Divided into four or five groups on basis of their sexual reproductive structures: Zygomycota, Ascomycota, Basidiomycota, Deuteromycetes, Fungi Imperfecti. Chytridiomycota
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Unformatted text preview: often included with Fungi Not plants; eukaryotic body called mycelium consists of masses of hyphae (filaments); cell walls of chitin; glycogen stored as reserve food; are heterotrophic; obtain food by spores and sexually by zygotic meiosis Oldest filaments appear in a Lower Cambrian; also some mycorrhizae in stems of an early Devonian plant; mycorrhizae may have facilitated the move of plants from water to land with fungi substituting for roots of the first land plants The principal decomposers together with the bacteria; most are saprotrophs (saprobes); some are causal agents of plant, animal, human diseases; many form important symbioses with roots of vascular plants (mycorrhizae); others are symbiotic with algae forming lichens ; some edible, others used commercially in brewing, baking, medicine...
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This note was uploaded on 11/14/2011 for the course BIO 1421 taught by Professor Farr during the Fall '08 term at Texas State.

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Viruses - often included with Fungi Not plants; eukaryotic...

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