The refractory period of a neuronal plasma membrane is important because it ____
a. establishes the resting potential
b. initiates an action potential
c. ensures that the threshold potential will be reached
d. ensures that an impulse will travel in a one-way direction
e. resets the threshold potential
ANSWER: d
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Surgical removal of the pancreas would
A. increase the acidity of the small intestine. B. prevent the production of chyme in the stomach. C. eliminate the ability to store bile in the gallbladder. D. block the secretion of bile. E. All of these changes would be a result of pancreas removal.
Why are we concerned at all with monitoring emerging/reemerging diseases?
A. These represent growing threats to human health that will require new scientific research and resources to effectively combat. B. Because globalization (greater trade and travel between countries) leads to more chances for spread of illnesses into new areas and populations. Monitoring these illnesses will help us to protect people. C. Because the speed of travel has increased greatly. With increased speed of travel, it is far more likely that a serious pathogenic threat from one area of the world can spread rapidly across the globe in a very fast manner. We need to monitor the occurrence of these illnesses to try to protect populations. D. All of the above.
The specific discipline that linked Mendel's and Darwin's work was ____
a. population biology b. paleontology
c. population genetics d. biogeography e. modern synthesis
Using an enzyme in a chemical reaction will reduce the need for
A. a coenzyme. B. an inhibitor. C. activation energy. D. end products.