Which specimen is quantitatively plated by using a calibrated loop?
a. Stool
b. Sputum
c. Joint fluid
d. Urine
D
Urine is plated using a calibrated loop to determine the amount of colonies present (i.e., colony count) and to decide whether the bacteria present are clinically significant or skin contamination.
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The different species of finches on the Galapagos Islands are believed to have arisen as a result of natural selection acting on populations of finches that had experienced
A. Convergent evolution B. Gene flow C. The bottleneck effect D. Geographic isolation E. hybrid sterility
After an oil spill, bacteria that can metabolize hydrocarbons are released for bioremediation. After a month, two areas affected by the spill show different levels of improvement. Which factor should be measured to determine the difference in effectiveness between the two sites?
A. Nutrient levels B. pH C. Salinity D. Oxygen levels E. Temperature F. All of these factors may play a role.
What level of biological organization is between the cell and the organ?
a) organism b) atom c) tissue d) organelle
The urinary system helps to maintain the extracellular fluid pH by ____.
A. synthesizing buffers B. retaining carbon dioxide in the filtrate C. excreting excess hydrogen ions D. combining hydrogen ions with urea E. excreting filtrate