Sickle-cell anemia in humans is an example of
A. disruptive selection.
B. directional selection.
C. stabilizing or balancing selection.
D. random chance.
Answer: C
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Turgor pressure is observed when a plant cells environment is ________________.
A. hypoosmotic B. isosmotic C. osmosis D. hyperosmotic
The USDA requires that food products from genetically modified organisms be clearly labeled as such
a. True b. False
Protozoa are classified according to
A. the type of chlorophyll they have. B. the number of cilia they have. C. their method of movement. D. the environment in which they live.
The signs and symptoms of infection with Helicobacter pylori are the result of
A) damage to the lining of blood vessels by H. pylori. B) invasion by H. pylori into the mucosa of the large intestine. C) invasion by H. pylori into the mucosa of the stomach. D) the production of exotoxins by H. pylori in the intestines. E) the production of toxins by H. pylori in contaminated food.