An ecologist studying productivity in a sample of grasses measures gross primary productivity as 1000 kcal/m2/yr and autotrophic respiration as 100 kcal/m2/yr. Based on these calculations, the net primary productivity would be
A) 10 kcal/m2/yr.
B) 900 kcal/m2/yr.
C) 1100 kcal/m2/yr.
D) 10,000 kcal/m2/yr.
B
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Male frogs give calls that attract female frogs to approach and mate. Researchers examined mating calls of closely related but separate species of tree frogs in South America. What outcomes could possibly occur where the ranges of two species overlap?
I) The species will interbreed, eventually fusing over time. II) A stable hybrid zone will form if hybrids are better adapted to the area of overlap than either parent species is. III) Species will continue to diverge and be isolated by behavioral or genetic mechanisms. A) I B) II C) III D) I, II, and III
Limiting nutrients in soils are generally organic compounds
Indicate whether the statement is true or false.
What causes antigenic variation?
A. gene mutation B. differential gene expression C. genetic rearrangement D. All of the answer options are correct.
Which of the following is NOT a possible function of magnetosomes?
A) Get cells to the North Pole B) Protect cells from hydrogen peroxide accumulation C) Store iron D) Locate suitable environments