The genus of bacteria that is able to fix nitrogen and form heterocysts is
A. Pseudomonas.
B. Escherichia.
C. Vibrio.
D. Anabaena.
D
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Acquired variations that are favorable to the survival of an organism tend to be present in greater frequency in the next
generation of those organisms. __________________ Indicate whether the statement is true or false.
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 type of interaction is this?
A. mutualism B. commensalism C. parasitism D. predation E. herbivory
Being born with extra fingers on a hand is called polydactyly. This is more common in some populations in North America than others due to
A. random mating with other populations in North America. B. natural selection in favor of extra fingers in these populations. C. a founder effect because their ancestors from Europe carried the alleles. D. migration of people with multiple fingers out of the population. E. an increase in mutation rate in these populations.
Answer the following questions true (T) or false (F)
1. Respiration is the only major process through which carbon moves from organic molecules back to the atmosphere. 2. Atmospheric N2 is useless to plants. 3. Too much nutrient runoff, particularly from nitrogen fertilizers, can cause dead zones in bodies of water.