In this diagram of a negative feedback system, what
labeled box represents an effector?
a. A
b. B
c. C
d. A and B
e. None of these
Answer: c
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In an inflammatory response, the direct effect of histamine is to ____
a. dilate blood vessels causing increased blood flow to the area of infection b. decrease heat accumulation in the area of infection c. directly kill bacteria d. attack cytotoxic T cells e. cause B cells to release antibodies
The inflammatory effects of immune complexes lodged in the kidney is called
A. renal phritis. B. rendema. C. glomerulonephritis. D. urethritis.
Jams, jellies, preserves, honey, and other foods with high sugar content hardly ever become contaminated by bacteria, even when the food containers are left open at room temperature. This is because bacteria that encounter such an environment ____
A) undergo death as a result of water loss from the cell B) are unable to metabolize the glucose or fructose, and thus starve to death C) are obligate anaerobes D) are unable to swim through these thick and viscous materials
Bacteria that require special growth factors and complex organic substances are called
A. harmless. B. aerobic. C. anaerobic. D. fastidious. E. pathogenic.