Which organism can cause granulomatous disease in animals and has been associated with soft-tissue infection in humans after animal bites?
a. S. paucimobilis
b. Weeksella virosa
c. Pasteurella multocida
d. Actinobacillus spp.
D
These organisms are part of the normal flora of humans and other animals. As such, they are generally of low virulence. Except for those species associated with periodontal infections, these organisms usually only cause infections in humans after an introduction into sterile sites after trauma such as bites or manipulations in the oral cavity.
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An E. coli strain has been found to constitutively express the lac operon despite the presence of the Lac repressor and absence of allolactose. It would be appropriate to surmise that a mutation in the Lac repressor has:
A. increased the Kd of the repressor. B. decreased the Kd of the repressor. C. increased binding of the repressor to DNA. D. increased binding of allolactose to the repressor. E. increased the rate of growth of E. coli.
The xylem is made from ________.
A. intercellular spaces between cells B. tubular living cells C. dead, hollow cells D. elongated living cells
Which characteristic is typical of a cancer cell but not of a normal cell?
A) Cell division is inhibited when the cell contacts neighboring cells. B) The cell cycle lacks S phase. C) The cell has the ability to invade surrounding tissue. D) Cell death occurs after a limited number of divisions.
Stroke is an interruption of blood flow to the lungs, which must have about 15% of the heart's output at rest.
a. true b. false