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31 terms

classes of microorganisms

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major classes of microorganisms
viruses, rickettsiae, fungi, protozoa, bacteria
one organism receives benefit from another organism, but causes it no harm
mutualism
one organism derives benefit from another organism, at the other's expense
parasitism
one organism produces substances or causes conditions which are lethal for other organisms
antibiosis
two different kinds of organisms living independently without affecting the other
independence
characteristics of protozoa
are multicellular, are microscopic, take their food in solid particles, are nonmotile, reproduce sexually or asexually by fission, when subjected to adverse conditions, the become very active.
transmitted by the bite of a female anopheles mosquito or by a contaminated hypodermic needle or blood transfusion
malaria
caused by entamoeba histolytica
amebic dysentery
characterized in women by vaginitis with a profuse, cream colored, foulsmelling discharge
trichomonas infection
characterized by chills and fever
malaria
occurs following fecal contamination of food or drink
amebic dysentery
symptoms are intense diarrhea with bloody, mucous filled stools
amebic dysentery
caused by a parasite of the plasmodium genus (several species)
malaria
characteristics of fungi
include yeasts and molds, are in plant kingdom, lack chlorophyll, contain over 100,000 species, some are a common sight on stale bread, rotten fruit, or damp leather, exist as parasites or saprophytes, most medically important fungi are visible to the naked eye.
characteristics or yeasts
reproduce by budding, some are used commercially in preparing beer, sine, and breads, are unicellular, microscopic organisms, a common cycosis of this is caused by candida albicans
characteristics of mold
are characterized by a fuzzy growth of interlacing filaments called hyphae, reproduce by spores, some may be seen on foods such as bread and cheese, are multicellular, a common mycosis if this is caused by tinea capitis
characteristics of bacteria
unicellular, simple plant organisms, ordinarily do not contain chlorophyll, have approximately 2000 known species and are found only on food, only about 100 species produce disease in human beings, are classified as pathogenic or nonpathogenic, reproduce asexually binary fission, have no cell wall
vibrio
short, slightly bent, comma shaped rod
diplococci
rod or cylinder shapes that appear in chains
staphylococci
sphere or round forms that appear in pairs
diplobacilli
rod or cylinder shapes that appear in pairs
spirillum
longer, rigid, curved organism, usually with several spirals and several flagella
streptococci
sphere or round forms that arrange themselves in grapelike clusters
flagella
are hair like processes that cause the bacteria to move along in liquid by their wavelike rhythmic contractions
spores
are round structures of condensed protoplasm that are formed within the bacteria
capsules
are layers that surround many bacterial cells and interfere with phagocytosis by white blood cells
endotoxins
are liberated only when the bacterial cell dies and disintegrates, examples are organisms which cause typhoid fever and bacillary dysentery.
exotoxins
diffuse out of the intact bacterial cells into the surrounding medium or tissue, examples are organisms causing tetanus, gas gangrene, diphtheria, and scarlet fever, are the most potent toxins known.
growth requirements of bacteria
favors growth, autotrophic bacteria use carbon dioxide and other inorganic compounds for food and are nonpathogenic, heterotrophic bacteria require living or dead organic matter for food and are pathogenic, parasites utilize living organic matter for food, saprophytes utilize dead organic matter for food, high heat destroys most bacteria, most bacteria killed in direct sunlight
characteristics of helminths
multicellular, are animal parasites, are commonly called worms.
types of hepatitis
chemically induced hepatitis could be caused by alcohol.