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Members of the Bacterial World quiz #2

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Terms in this set (21)

  • Which bacteria use their flagella to invade mucus membranes and cause infections?

    Bacteria such as Vibrio cholerae use flagella to invade mucus membranes.

  • What are the two bacterial defense mechanisms against viruses?

    Restriction enzymes and CRISPR systems are bacterial defense mechanisms against viruses.

  • Which bacteria are routinely tested for drug susceptibility?

    Pathogenic bacteria such as Staphylococcus aureus and Escherichia coli are routinely tested.

  • Name a bacterial pathogen that does not form spores.

    Escherichia coli is not a spore-forming pathogen.

  • Under what circumstances is it relevant to establish the number of bacterial cells in a sample?

    It is relevant when assessing contamination, infection risk, or effectiveness of sterilization.

  • What factor is believed to limit the size of most bacterial cells?

    Surface area-to-volume ratio limits the size of bacterial cells.

  • In what clinical scenarios is a bactericidal drug preferred over a bacteriostatic drug?

    Bactericidal drugs are preferred in severe infections or in immunocompromised patients.

  • What are key characteristics of Clostridium difficile?

    Clostridium difficile is a spore-forming bacterium that can cause antibiotic-associated diarrhea.

  • Which organisms can grow on agar plates incubated in an anaerobic jar?

    Obligate anaerobes and facultative anaerobes will grow in an anaerobic jar.

  • What are bacterioplankton and what role do they play in the environment?

    Bacterioplankton are bacteria that live in aquatic environments and contribute to nutrient cycling.

  • Which antibacterials are effective against Pseudomonas aeruginosa?

    Antibiotics such as piperacillin-tazobactam and ciprofloxacin are effective against Pseudomonas aeruginosa.

  • Which nonpathogenic strain safely used in teaching labs?

    Escherichia coli K-12 is a nonpathogenic strain used in teaching labs.

  • In streptococci, what is the typical arrangement of the cells?

    Streptococci typically form chains of spherical cells.

  • Name an infectious disease caused by a bacteria that is also communicable.

    Tuberculosis is an infectious and communicable disease.

  • What is Propionibacterium acnes and what condition is it associated with?

    Propionibacterium acnes is a skin bacterium associated with acne.

  • What are some contributing factors to the pathogenicity of N. gonorrhoeae?

    Pili for attachment and the ability to evade the immune system.

  • A commensal bacterium is one that:

    Lives on or in a host without causing harm.

  • Nonpathogenic bacteria are:

    Harmless and do not cause disease.

  • The domain Bacteria consists of organisms which are:

    Unicellular prokaryotes with cell walls containing peptidoglycan.

  • The fimbriae of Neisseria gonorrhoeae and enteropathogenic E. coli are examples of:

    Fimbriae are examples of bacterial attachment structures.

  • Penicillin would be most effective against:

    Penicillin is most effective against gram-positive bacteria.