During adaptive radiation one species adapts to form several additional species quickly. Before speciation occurs, the original species can be termed as which of the following?
a. parent species
b. novel species
c. first species
d. found species
d. found species
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An array of organisms together with their
physical environment is which of the following?
a. population b. community c. ecosystem d. biosphere e. landscape
What is the significance of the industrial practice of waiting for cultures to enter the stationary phase of growth before harvest?
A) The cells are at peak metabolic activity. B) Secondary metabolites are often the desired product, and are only produced in stationary phase. C) The desired primary metabolites are produced in stationary phase. D) Potential toxins from log phase growth have been depleted. E) An optimal combination of primary and secondary metabolites is being produced.
Ben, a 17 year-old wrestler, developed a lesion on his upper back. The lesion was relatively round and consisted of a pink scaly rough center and raised edge. While it wasn't painful, the itching was bothersome to the young man. HIs coach advised him to see his doctor about the lesion. Upon visiting his physician, a scraping of the affected area was collected and placed in a drop of KOH, then examined under the microscope, revealing slender fungal hyphae. A culture was inoculated, which grew a spreading flat fuzzy colony after 10 days of incubation at 30oC. Microscopic examination of the culture demonstrated the presence of both macroconidia and microconidia. What is the most likely diagnosis?
A. Cutaneous blastomycosis B. Dermatophytosis C. Sporotrichosis D. Candidiasis E. Tinea versicolor
Acid-fast organisms such as Mycobacterium tuberculosis contain ________ constructed from mycolic acids in their cell walls.
A. proteins B. lipids C. carbohydrates D. peptidoglycan