The Staphylococcaceae staphylococcus that is more likely to cause uncomplicated urinary tract infections in nonhospitalized hosts, especially sexually active young women, is:
a. S. saprophyticus.
b. S. aureus.
c. S. epidermidis.
d. S. intermedius.
A
S. saprophyticus is most frequently associated with community-associated urinary tract infections in young, sexually active females but is not commonly associated with hospital-associated infections or any infections at nonurinary tract sites.
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Three-spined stickleback fish (Gasterosteus aculeatus) show substantial heritable variation in gill-raker length related to differences in their diets. Longer gill rakers appear to function better for capturing open-water prey,
while shorter gill rakers function better for capturing shallow-water prey. Which of the following types of selection is most likely to be found in a large lake (open water in the middle and shallow water around the sides) with a high density of these fish? A) directional selection B) stabilizing selection C) disruptive selection D) sexual selection
True or false: Competition can occur over resources such as space, mates, and nesting sites, not just over food
A. true B. false
What percentage of the immigrants into your experimental populations have the A allele?
a. 50% b. 5% c. 0.5%
Small areas that are home to a large number of threatened species and an exceptional concentration of species found nowhere else on Earth are called
A) biomes. B) movement corridors. C) biodiversity hot spots. D) local populations.