In the second half of the twentieth century, human activities have more than tripled the amount of nitrogen released
from land into the atmosphere or aquatic systems.
Indicate whether the statement is true or false.
ANSWER: False - doubled
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Cholesterol is a structural component of cell membranes. The amount of cholesterol present can affect membrane stability and permeability. What is the role of cholesterol in a membrane?
A. A membrane that needs to be more rigid and more permeable, would have high cholesterol ratios. B. Membranes with high amounts of cholesterol are very stable and have decreased permeability. C. Membranes with low amounts of cholesterol are very stable and have increased permeability. D. A membrane that needs to be rigid, such as a protective barrier, would have low cholesterol ratios.
What is the genetic material of all known organisms and viruses?
a. always DNA b. always RNA c. always nucleic acid d. protein e. None of the above
Bile salts are synthesized from
a. hydrochloric acid. b. uric acid. c. cholesterol. d. mucus. e. sodium chloride.
What process is responsible for the flow of water through a plant, from the soil to the leaves?
A) translocation B) transpiration C) respiration D) internal pumping