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Questions and Answers
Which enzyme is characteristic of Enterobacteriaceae?
Which enzyme is characteristic of Enterobacteriaceae?
Which genus is not classified under tribe I: Escherichieae?
Which genus is not classified under tribe I: Escherichieae?
How do Enterobacteriaceae bacteria move when motile?
How do Enterobacteriaceae bacteria move when motile?
What type of fermentation is performed by Shigella sonnei?
What type of fermentation is performed by Shigella sonnei?
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Which genera of Enterobacteriaceae are lactose fermenters?
Which genera of Enterobacteriaceae are lactose fermenters?
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Study Notes
General Characters of Enterobacteriaceae
- Enterobacteriaceae are Gram-negative rods that are motile with peritrichate flagella or non-motile, and do not form spores.
- They ferment glucose with or without gas formation, reduce nitrates to nitrites, and produce catalase, but are oxidase negative and aerobic or anaerobic.
Classification of Enterobacteriaceae
Based on Action on Lactose
- Lactose fermenters: Examples include Escherichia coli and Klebsiella.
- Late lactose fermenters: Examples include Shigella sonnei.
- Non-lactose fermenters: Examples include Salmonella and Shigella.
Modern Taxonomical Concept
- Enterobacteriaceae can be classified into tribes, genera, and species based on their cultural and biochemical characteristics.
- There are currently five tribes within Enterobacteriaceae.
- Tribe Escherichieae includes the following genera:
- Escherichia
- Edwardsiella
- Citrobacter
- Salmonella
- Shigella
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Description
Learn about the general characteristics and classification of Enterobacteriaceae, a family of Gram-negative bacteria found in the intestine, including their motility, fermentation, and enzyme production.
