An insecticidal protein has been discovered in a bacterium known as
A. Bacillus thuringiensis.
B. Aspergillus sp.
C. Agrobacterium tumefaciens.
D. Escherichia coli.
Answer: A
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Finding no bacterial growth, despite persistent urinary tract symptoms, indicates that the problem is likely either non-pathogenically physiological or psychosomatic
Indicate whether the statement is true or false.
Why is it that there is less variation among individuals in any one non-African population than among individuals in the contemporary African population?
A. Because the individuals that left Africa were a relatively small sample of the total amount of variation present. B. Because the individuals that left Africa exhibited a greater number of mutations than the African population. C. Because the African population was larger than the populations that left, they had more mutation. D. There is no reason because the above statement is incorrect.
Why is the traditionally defined taxon Reptilia paraphyletic?
What will be an ideal response?
Your friend is an amateur aquarist learning to breed clownfish. She had one successful clutch of eggs, and moved the mother and fry with their anemone to a separate tank leaving only male fish behind. Now, she is surprised to find that a new female fish has appeared in the original tank. What is the most likely explanation for this?
A. Some anemone species secrete pheromones that control the sex of fish as a way to regulate predation. Removal of the anemone allowed a new female to develop. B. In urban areas, tap water is polluted with contamination from endocrine disruptors such as BPA and PCBs. When she removed some of the tank water for the new tank, she should have replaced it with bottled water. C. Clownfish are protandrous hermaphrodites that respond to social cues. Removal of the dominant female allowed the second-largest fish to transform into a female. D. Clownfish synchronize their mating based on seasonal cues indicated by salinity. When she replaced some of the tank water, the lower salinity caused the fish to change into a female. Clarify Question What is the key concept addressed by the question? What type of thinking is required? Gather Content What do you already know about the reproductive modes of fish? What other information is related to the question? Choose Answer Given what you now know, what information is most likely to produce the correct answer? Reflect on Process Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?