The major virulence factors of Yersinia pestis are carried on
A. the chromosome.
B. a plasmid.
C. three separate plasmids.
D. nuclear membrane.
C
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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.
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
Where can the pathogen Mycobacterium tuberculosis remain dormant for an extended period of time?
A) blood B) lungs C) soil D) intestines
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