All of the following statements concerning nitrogen fixation are true EXCEPT which one?
A. The amount of carbon that is taken up by plants and microbes can be dictated by how much nitrogen is available to support growth.
B. Nitrogen fixing microbes convert N2 to ammonia.
C. The products of nitrogen fixation are incorporated into amino acids and nucleic acids.
D. Nitrogen fixation does not affect the rate of carbon flux.
Answer: D
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Charles Darwin observed an orchid flower with very long, thin tubes that prevent many species from feeding on the flower nectar and pollinating the flower. He offered a prediction that some species of pollinators would eventually be found that can feed and pollinate through the small tube. You decide to test Charles Darwin's proposal by placing nets over some orchids that allow small pollinators to enter, but prevent the large sphinx moth from entering. You then compare the number of seeds produced by plants with and without the nets. The seed production is
A. a hypothesis. B. a standardized variable. C. a theory. D. an independent variable. E. a dependent variable.
A salt will dissolve in water to form
a. acids. b. hydrogen bonds. c. ions other than H+ and OH-. d. bases. e. buffers
The main weight-bearing bone in the lower extremities is known as the ________
A) fibula B) tibia C) pelvis D) femur
Female blue-footed boobies of the Galápagos Islands will mate only after a specific courtship display on the part of the male. The male high-steps to advertise his bright blue feet
What mechanism describes why the females do not mate with other species of boobies? A) Temporal isolation B) Ecological isolation C) Geographic isolation D) Mechanical incompatibility E) Behavioral isolation