Alcohol acts as a surfactant and a protein coagulant. Which of the following statements are true concerning its mechanism of action?
A. 100% ethanol is a better microbicide than lower concentrations since the more concentrated it is, the more effective the activity.
B. 70% ethanol is a better microbicide than 100% alcohol since water molecules are necessary to coagulate proteins.
C. Ethanol is a better microbicide than isopropyl alcohol.
D. Despite not killing endospores, ethanol is still considered a sterilizing agent.
B. 70% ethanol is a better microbicide than 100% alcohol since water molecules are necessary to coagulate proteins.
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What types of cells perform cell division?
a. prokaryotes only b. eukaryotes only c. both prokaryotes and eukaryotes d. neither prokaryotes, nor eukaryotes
Coral reefs found very close to the shore of islands and continents are called:
a. atolls. b. barrier reefs. c. table reefs. d. fringing reefs.
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
Cells are differentiated after which step in the Gram stain?
a. Alcohol-acetone b. Iodine c. Crystal violet d. Safranin