A 59-year-old patient with cancer who was receiving high doses of chemotherapy developed a secondary lung infection that was identified as a fungus. The organism disseminated, which ul-timately was fatal to the patient. The organism isolated from sputum exhibited septate hyphae that were dichotomous. The organism is most likely which of the following?
a. Candida
b. Cryptococcus
c. Aspergillus
d. Zygomycetes
C
Infections primarily occur in patients with some type of compromise to their immune system. The infection may be secondary to an underlying disease process, such as diabetes mellitus, or the result of an immunosuppressive agent. Although any fungus can potentially cause disease in these patients, the most commonly encountered organisms in this group include Aspergillus, Zy-gomycetes, Candida, and Cryptococcus, among others. All of these organisms may cause disse-minated (systemic) disease. Aspergillus, however, exhibits septate hyphae that are dichotomous
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A. 1.0 B. 4.5 C. 7.0 D. 9.1 E. 11.5
Which of these processes are coupled in prokaryotes but NOT in eukaryotes?
A) transcription and translation B) replication and transcription C) replication and translation D) transcription and splicing
You live at the base of a mountain where there is a tropical forest. As you travel up the mountain you would expect
A. the kinds of plants and animals to be similar at the base and top of the mountain. B. the forest will change into a grassland. C. to see organisms similar to those found in more northerly climates. D. to find desert.
During cytokinesis in an animal cell, a constricting ring pinches the dividing cell into the two daughter cells. This contractile ring is formed by which of the following structures?
a. Centrioles b. Microtubules c. Microfilaments d. Z discs e. The spindle apparatus