House finches were found only in western North America until 1939, when a few individuals were released in New York City. These individuals established a breeding population and gradually expanded their range
The western population also expanded its range somewhat eastward, and the two populations have recently come in contact. If the two forms were unable to interbreed when their expanding ranges met, it would be an example of _____.
A) prezygotic isolation
B) reinforcement
C) autopolyploidy
D) allopatric speciation
E) sympatric speciation
Answer: D
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CAM plants keep stomata closed in the daytime, thus reducing loss of water. They can do this because they _____
A) fix CO2 into organic acids during the night B) fix CO2 into sugars in the bundle-sheath cells C) fix CO2 into pyruvate in the mesophyll cells D) use the enzyme phosphofructokinase, which outcompetes rubisco for CO2 E) use photosystem I and photosystem II at night
An extended period of torpor entered by an animal during the summer when the environment is too hot
and water is too scarce is called
a. estivation. b. hyperthermia. c. thermal acclimatization. d. hypothermia. e. hibernation.
Proper cross-matching of blood type is essential for safe blood transfusion
What is the general rule for safe blood transfusion, and what are the consequences if a patient receives the incorrect blood type by accident? If a patient's blood type is unknown, what is the safest course of action?
A fever, stimulated by endogenous pyrogens, enhances the nonspecific immune response by
A) Stimulating leukocytes to destroy microbes B) Enhancing specific activity of the immune system C) Decreasing the amount of iron available to microbes D) All of the above