In Gram staining, ethanol-acetone is used as a
A) decolorizing agent.
B) counterstain.
C) mordant.
D) drying agent.
E) primary stain.
A
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Streptococcus pneumoniae is a bacterium that has long been recognized as a major pathogen
causing pneumonia. Based on its name, how might it look under a microscope?
a. Because it is a bacterium, it will be very small and difficult to distinguish. b. It would look like a chain of round beads or balls. c. It would be about the size of a eukaryotic cell. d. both (b) and (c)
Respiratory syncytial virus
A. uses the nasopharynx as its main replication site. B. has symptoms of dyspnea and rales. C. can be treated with the antiviral aerosol ribavirin. D. causes serious disease in infants 6 months old or younger. E. All of the choices are correct.
A clownfish may lure fish towards a sea anemone and get scraps of food in return. What kind of symbiotic relationship does this demonstrate?
a. Commensalism b. Mutualism c. Parasitism d. None of these choices
Bacteriorhodopsin is a light-sensitive pigment found
in _________ archaeans and used to supply energy for __________. production. a. halophilic; ATP b. thermophilic; carbohydrate c. methanogenic; methane d. halophilic; carbohydrate e. thermophilic; ATP