ALL of the following genera may be found at hydrothermal vent sites EXCEPT
a. Sulfolobus.
b. Pyrolobus.
c. Pyrodictium.
d. Staphylothermus.
Answer: B
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The first test that is always performed on organisms growing on solid or liquid mycobacterial media is a(n):
a. niacin test. b. acid-fast stain. c. Gram stain. d. broth test.
The internal architecture of a cell consists of
A) microtubules, intermediate filaments, and microfilaments. B) cilia and flagella. C) chitin and chlorophyll. D) lipid bilayers.
Which population was unaffected by density-dependent factors?
A) elk in Yellowstone National Park in the 1970s B) Norway lemmings C) yeast that ferment grape juice into wine D) bacteria kept in a culture that has its nutrients constantly replenished
An accidental spill of a pesticide locally wiped out the most abundant species of butterfly in coastal California. Most of the bird species in the area had fed on this butterfly, but they switched prey to moths, and thus the birds showed only a small
decrease in population size. The butterflies were a/an: A) keystone species, and thus they were driven to extinction very easily. B) endangered species. C) pioneer species. D) ecological dominant, but they were not a keystone species.