American sycamore (Platanus occidentalis) and European sycamore (Platanus orientalis) are tree species that will interbreed if planted nearby but will not normally interbreed because they occur on different continents. This is an example of
A. mechanical isolation.
B. temporal isolation.
C. habitat isolation.
D. behavioral isolation.
E. gametic isolation.
C. habitat isolation.
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Green sulfur bacteria are often found at the greatest depths of all phototrophic cells in lakes, oceans, and microbial mats. This is because green sulfur bacteria
A) are very sensitive to UV irradiation, despite their reliance on light for energy. B) are the only phototrophs that can use hydrogen sulfide as an electron donor for photosynthesis. C) are strict anaerobes. D) have chlorosomes that are very efficient at harvesting light, allowing them to perform photosynthesis where light intensities are very low.
Which of the following is not an assumption of Hardy-Weinberg equilibrium?
A. Populations must select non-random mates. B. No selection must be taking place. C. Mutations are not occurring. D. Populations must be large. E. Individuals are not entering or leaving the population.
Enzymes used to cut DNA molecules in recombinant DNA research are
a. ligases. b. restriction enzymes. c. transcriptases. d. DNA polymerases. e. replicases.
What were the three major invasions of living creatures on land?
What will be an ideal response?