one organism produces substances or causes conditions which are lethal for other organisms
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
characterized in women by vaginitis with a profuse, cream colored, foulsmelling discharge
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
are hair like processes that cause the bacteria to move along in liquid by their wavelike rhythmic contractions
are layers that surround many bacterial cells and interfere with phagocytosis by white blood cells
are liberated only when the bacterial cell dies and disintegrates, examples are organisms which cause typhoid fever and bacillary dysentery.
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