The major virulence factors of Yersinia pestis are carried on

A. the chromosome.
B. a plasmid.
C. three separate plasmids.
D. nuclear membrane.


C

Biology & Microbiology

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A mutation creates a deletion in the C-terminal region of the bacterial RecA protein of E. coli rendering it Rec-. It would be reasonable to surmise this mutation might:

A. increase autoinhibition of RecA. B. increase RecA binding to DNA. C. decrease autoinhibition of RecA. D. be both A and B. E. be both B and C.

Biology & Microbiology

The phase at the end of an action potential when the membrane potential becomes more negative than it is at rest is the ________ phase

A) threshold B) depolarizing C) repolarizing D) hyperpolarizing E) refractory

Biology & Microbiology

Where can the pathogen Mycobacterium tuberculosis remain dormant for an extended period of time?

A) blood B) lungs C) soil D) intestines

Biology & Microbiology

Bacteria in the stationary phase have a few phenotypes that are less sensitive to antibiotic targeting the cell wall. which phenotype is the most resistant to antibiotics.

a. persisiter cells b. endospores c. viable but non-culturable d. physical disinfectant

Biology & Microbiology