Abnormally folded proteins that cause normal proteins to re-fold into abnormal configurations are called:
a. prions
b. nucleotides
c. peptides
d. polymers
e. triglycerides
a
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An increase in the extracellular concentration of salts will cause body cells to ____ water and ____.
A. lose, shrink B. lose, swell C. gain, shrink D. gain, swell E. metabolize, heat up
Which of the following would not be used as a final electron acceptor in anaerobic respiration?
A) oxygen B) sulfur C) protons D) iron E) nitrogen
An example of a nonbiological factor that affects community structure is ____
a. mutualism b. competition c. parasitism d. predation e. rainfall
The main effect of burning peat, wood, coal, and petroleum on the Earth's climate is
A. the fires release back into the atmosphere carbon dioxide that was once taken from the atmosphere by plants and stored in their own tissues; the increased carbon dioxide holds in solar heat and causes a rise in temperature. B. the rising heat from fires produces wind that cools the surface of the Earth. C. the fires significantly heat the air and cause a rise in global temperature. D. the smoke blocks sunlight from reaching the Earth and causes a significant lowering of the Earth's temperature. E. the fires use up oxygen that would otherwise block penetration of ultraviolet light from reaching the Earth; the increased ultraviolet radiation heats the Earth.