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Showing posts with the label commensals

MCQs on Enterobacteriaceae, gut flora

Enteric bacteria/ Gut flora -  E. coli, Salmonella spp, and Shigella spp 1) A large family of enteric bacteria is present as normal flora in the intestines of humans and other mammals. Which of the following is less likely to be found as the normal flora of the intestine?   a) Escherichia spp b) Salmonella spp c) Staphylococcus spp d) Proteus spp 2) Which of the following bacteria is not a clinically important enterobacteriaceae? a) E.coli b) Streptococcus  pyogenes c) Salmonella typhi d) Proteus mirabilis 3) All are the important general characteristics of enteric bacteria, EXCEPT ? a) Aerobic and facultatively anaerobic b) Non-spore forming c) Grow in media with bile salts d) Do not produce nitrates e) Ferment glucose f) Most of them are catalase positive and oxidase negative 4) Enteric bacteria are mainly classified based on their ability to ferment various sugars including lactose.  Which of the following bacteria is a non-lactose fermen...