A 76-year-old man with intermittent fevers has blood cultures drawn three times. The second set is positive and grew out of a Corynebacterium spp. This organism is considered:
a. pathogenic.
b. virulent.
c. a contaminant.
d. normal flora.
C
Growth of Bacillus spp., Corynebacterium spp., Propionibacterium acnes, or coagulase-negative staphylococci in one of several cultures should be considered a probable contaminant.
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Whooping cough is caused by ________.
A. Yersinia pestis B. Klebsiella pneumoniae C. Vibrio parahaemolyticus D. Bordetella pertussis
All animals use forms of the pigment retinal in their photoreceptors to absorb light energy. What vitamin is retinal synthesized from?
1.Vitamin A 2.Vitamin C 3.Vitamin D 4.Vitamin E
Individuals can inherit a defective APC gene on chromosome 5 from one parent that makes them susceptible to developing familial adenomatous polyposis. In which cells is this deletion present in affected individuals?
A) somatic cells B) germ cell precursors C) colon polyp cells D) colon epithelial cells E) all cells
The organism with the largest relative genome size is
A. rice. B. human. C. yeast. D. fruit fly.