A microbiologist is attempting to check for the presence of Mycobacterium tuberculosis in a sputum sample. This particular bacterium, if present, would have a particularly impervious outer wall. What type staining technique might be used to check for this bacterium?
A) Gram stain
B) simple stain
C) negative stain
D) acid-fast stain
Ans: D) acid-fast stain
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Which of the following best describes the photosynthetic membranes of the purple nonsulfur bacteria?
A. The photosynthetic membranes are not associated with the plasma membrane. B. The photosynthetic membranes are continuous with the plasma membrane. C. The photosynthetic membranes are attached to the plasma membrane but not continuous with it. D. There are no photosynthetic membranes in the purple nonsulfur bacteria.
Nocardia spp. cause which of the following types of infections in individuals who are immuno-compromised?
a. Mycetoma b. Lymphocutaneous infections c. Skin abscesses or cellulites d. Invasive pulmonary infections
Why does trimming the top of a plant make the plant bushier?
A. Trimming disrupts vertical transport routes for water and nutrients while enhancing horizontal transport routes. B. Trimming damages or removes the apical meristem which activates the axillary meristems to grow. C. Trimming stimulates the plant to produce more rhizomes which results in more branches. D. Trimming forces leaves around the vicinity of the cuts to become reproductive leaves. E. Trimming stimulates the cork cambium to produce more secondary growth.
The rickettsial parasite Wolbachia pipientis can ________.
A. enhance the lifespan of an infected wasp B. confer toxicity to the sting of an infected wasp C. sometimes alter the sex of an infected wasp D. None of the choices are correct.