A 68-year-old man has an osteomyelitis infection as a result of bacteremia. The most common etiologic agent found in this infection is:
a. Haemophilus spp.
b. S. aureus.
c. Pseudomonas aeruginosa.
d. Fusobacterium necrophorum.
B
S. aureus, seeded during bacteremia, is the most common etiologic agent of osteomyelitis among patients of all age groups. The toxins and enzymes produced by this bacterium, as well as its ability to adhere to smooth surfaces and produce a protective glycocalyx coating, seem to con-tribute to the organism's pathogenicity.
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Sea otter populations were reduced by overhunting, allowing an overgrowth of one of their prey
animals, the ____, which consumed populations of ____ and decimated them.
a. crabs; shrimp b. abalone; algae c. sea urchin; kelp d. harbor seals; fish e. crab; kelp
Sharks differ from most other fishes in that
they lack
a. lungs. b. scales. c. bones. d. paired appendages. e. jaws.
A population of organsims that breaks away and becomes different from the original population through isolation and separate evolution might eventually become a separate
a) phylum b) order c) class d) species e) genus
What is the minimum number of aminoacyl-tRNA synthetase enzymes needed to attach amino acids to all the various tRNA molecules?
A. 64 B. 61 C. 20 D. As many as there are different tRNAs