Prosthecae are an adaptation for
A) anaerobic growth.
B) cell differentiation under harsh conditions.
C) nitrogen fixation.
D) low nutrient aquatic environments.
Answer: D
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The exchange surfaces of fish gills are arranged as rows of
A. lamellae. B. trachea. C. alveoli. D. parabronchi. E. spiracles.
What differentiates diagnostic techniques that employ phenotypic (culture-based) methods from those that employ molecular methods?
a. Phenotypic methods are highly sensitive and specific, while molecular methods are not. b. Phenotypic methods examine the growth behavior of a microorganism and the pro-teins, enzymes, or toxins produced, while molecular methods examine the genetic makeup. c. Phenotypic methods are quantitative while molecular methods are not. d. Phenotypic methods are not limited to de-tection of live organisms as are molecular methods.
You have made a smear of a bacterial culture and have performed the Gram stain on it. Looking at the organism under the microscope, you notice that the cells do not seem to be the dark blue-purple of a gram-positive reaction, but instead are light purple. Your staining procedure was performed correctly. What is your best explanation as to why the bacteria have stained this way?
A. The specimen did not undergo heat fixation before staining; therefore, the primary dye does not stick properly to the wall. B. These are mutant bacteria which cannot be stained like other bacteria. C. The bacteria were taken from an inappropriate medium, and a chemical is interfering with proper staining of the cells. D. There is something in the wall of the bacteria that has affected the uptake of the crystal violet into the cell wall, thereby staining it improperly.
Which country is expected to be invited to join NAFTA?
a. Brazil b. Venezuela c. Honduras d. Chile