Which of the following is an important characteristic for a model organism?
A) marginally characterized
B) difficult to manipulate in the laboratory
C) prone to random changes that alter primary characteristics
D) widely studied
E) all of the above
Answer: D
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One of the concerns with the use of genetically-engineered, herbicide-resistant crops is _________
A. decreased yields D. loss of genetic diversity B. potential allergic reactions E. the expense of using herbicides C. transfer of herbicide resistance to weeds
Why are most food chains limited to three to five trophic levels?
A) The higher the trophic level, the larger the organism; the larger the organism, the less likely it will be prey. B) The nutritional quality of existing biomass decreases with increasing trophic level. C) Most ecosystems have insufficient space to support the increased number of organisms that more trophic levels would require. D) There is insufficient energy to support more trophic levels.
Trypanosomiasis is spread by
A. contaminated water. B. fleas on rats. C. tsetse flies. D. mosquitoes. E. airborne droplets.
After lowering its body temperature, a shaved shrew would lose less heat by convection.
a. true b. false