The growth factor that stimulates fibroblasts to divide around a wound is released by
a. other fibroblasts.
b. capillary endothelial cells.
c. platelets.
d. lymphocytes.
Ans: c. platelets.
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Which of the following pollutants is associated with thyroid cancer?
a. nitrate b. nitrous oxide c. ammonia d. phosphate e. more than one of these
Which of the following statements is NOT true of
fungal spores? They a. are small. b. are dispersed by air currents. c. are hydrated. d. may germinate to start a new mycelium. e. may be sexual or asexual.
The photosynthetic membrane of Halobacterium salinarium contains ________.
A. archaeochlorophyll B. bacteriorhodopsin C. chlorophyll a and b D. bacteriochlorophyll
Obligate ______ live at low pH extremes and sometimes maintain the low pH by releasing strong acid.
A) Acidophiles B) Halophiles C) Alkalinophiles D) Osmophiles