Experiments are carried out to test a hypothesis by changing one variable at a time and including an unchanged variable termed a(n) ________.
A. experimental variable
B. control
C. stable variable
D. altered variable
Answer: B
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Macroscopic examination of granules from lesions of mycetoma reveals them to be white to yellow and 0.2 to 2 mm in diameter. Microscopically, the granules consist of loosely arranged, intertwined septate hyaline hyphae cemented together. Which organism can cause a mycetoma infection?
a. Fonsecaea spp. b. E. dermatitidis c. Cladosporium spp. d. P. boydii
Nitrogen can be obtained from either organic or inorganic sources.
Answer the following statement true (T) or false (F)
Nitrification is the process of ____
a. converting nitrogen gas to ammonia b. converting nitrogen gas to nitrate c. converting ammonium to nitrate d. converting nitrate to ammonia e. converting nitrate to nitrogen gas
Which of the following are normal corrective responses of the body to hypoxia? (Select all that apply.)
a. An increase in erythropoietin increases the production of red blood cells b. A rise in ventilation c. An increase in heart rate d. An increased production of lactic acid