Which is an example of the Red Queen hypothesis?
a. As spiders evolve resistance to a viral disease, the virus becomes more virulent.
b. Dogs evolve characteristics that are selected by humans.
c. Dinosaurs lack the adaptations to survive predation of their eggs by small mammals.
d. Horses evolve from a five toed animal to one toe.
e. Cats and cows separately, but for similar purposes, evolve scratchy tongues.
ANSWER: a
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A) nitrate / oxidize sulfide B) oxygen / oxidize sulfur C) sulfur / reduce nitrate D) glycogen / provide energy
Suppose a DNA fingerprinting analysis reveals that DNA from a crime scene matches a suspect’s DNA at four out of
five different loci. What can be concluded from this information?
What will be an ideal response?Nitrogen-fixing bacteria in the roots of soybeans help provide a source of nitrogen to the plants, and in exchange, the bacteria obtain food from the plants. Which reaction can these bacteria catalyze?
A. nitrogen gas (N2) to nitrate (NO3) B. ammonium (NH4+) to nitrate (NO3) C. nitrogen gas (N2) to ammonium (NH4+) D. nitrate (NO3) to ammonium (NH4+) E. nitrate (NO3) to nitrogen gas (N2)
In the water cycle, evaporated equatorial water that rises and does not immediately rain back down proceeds to
A. the poles where it causes snow. B. about 30° north or south and then cools and condenses, supporting a band of moist vegetation. C. the poles if it does not encounter mountain ranges, which it usually does. D. about 60° north or south and then cools and condenses, supporting a band of moist vegetation.