In addition to being a group of gram-negative bacteria considered normal flora of the gastroin-testinal tract of humans and animals, which one of the following also contains agents of impor-tant diseases such as gastroenteritis and enteric fevers, urinary tract infections, and bacterial pneumonia?
a. Neisseriaceae
b. Micrococcaceae
c. Enterococcus
d. Enterobacteriaceae
D
Enterobacteriaceae inhabit a wide variety of niches that include the human gastrointestinal tract, the gastrointestinal tract of other animals, and various environmental sites. Some are agents of zoonosis, causing infections in animal populations. Just as the reservoirs for these organisms vary, so do their modes of transmission to humans.
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You find a protist that is unicellular, heterotrophic, and non-flagellated. It has two nuclei of different sizes. You
correctly conclude that this organism is a(n) ____.
a. kinetoplastid b. plasmodial slime mold c. ciliate d. foram e. amoebozoan
Red blood cells
a. have a large nucleus when they enter circulation. b. do not have a nucleus when they enter circulation. c. are the only cells to lack hemoglobin. d. develop in the yellow marrow. e. fit more than one of these descriptions
has a disproportionately large effect on a community relative to its abundance
b. controls the prey species c. may increase or decrease the number of prey species in a community d. has a disproportionately large effect on a community relative to its abundance and may increase or decrease the number of prey species in a community e. has a disproportionately large effect on a community relative to its abundance, controls the prey species, and may increase or decrease the number of prey species in a community
The most potent chemicals for activating pain receptors are
a. bradykinins. b. histamines. c. prostaglandins. d. cytokines. e. leukotrienes.