Cholesterol affects the fluidity of membranes into which it inserts by
a. increasing membrane fluidity at all temperatures.
b. decreasing membrane fluidity at all temperatures.
c. decreasing membrane fluidity at high temperatures and increasing membrane fluidity at low temperatures.
d. increasing membrane fluidity at high temperatures and decreasing membrane fluidity at low temperatures.
Ans: c. decreasing membrane fluidity at high temperatures and increasing membrane fluidity at low temperatures.
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Which of the following are thought to have occurred because of the increase of oxygen (O2) in the atmosphere during and after the Silurian Period?
A. Conquest of land by arthropods. B. Conquest of land by arthropods and vertebrates. C. Increases in animal body sizes and conquest of land by plants. D. Conquest of land by arthropods and vertebrates, and plants. E. Conquest of land by arthropods and vertebrates and an increase in animal body sizes.
Which of the following Trichophyton spp. grows slowly (14 to 30 days) and best at 35°C to 37°C? In addition, enriched media with thiamine and inositol enhance its growth
a. Trichophyton verrucosum b. Trichophyton tonsurans c. T. rubrum d. T. mentagrophytes
When antibodies or other substances in serum cross-react with the test reagents, a false positive result can occur.
a. true b. false
Because plants extract nutrients from soil and use sunlight as an energy source, they are considered to be
A. autotrophs. B. consumers. C. heterotrophs. D. decomposers.