Which of the following statements is false?
a. E. coli never causes disease.
b. E. coli provides vitamin K for its host.
c. E. coli often exists in a mutualistic relationship with humans.
d. E. coli gets nutrients from intestinal contents.
Answer: a. E. coli never causes disease.
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In the biochemical regulation of metabolic pathways, how would one overcome the effects of a competitive inhibitor on enzyme activity?
A. Increase the amount of substrate for the enzyme. B. Increase the amount of competitive inhibitor. C. Increase the temperature of the reaction. D. Decrease the amount of enzyme. E. Add a noncompetitive inhibitor of the enzyme.
Ecdysis is:
A. development of the ectoderm layer in the gastrula B. development of the epidermis from the ectoderm C. disintegration of the ectoderm D. molting E. the feeding tentacles of the Ecdysozoa
Some scientists have suggested that recent outbreaks of sudden oak disease could be fought through the creation of transgenic plants with genetic resistance to sudden oak disease. What would be the most likely source of this genetic resistance?
A. a species of aphid with resistance to sudden oak disease B. entirely new genes created in a lab and inserted into the oak genome C. other tree species with unusually high levels of host plant resistance D. domesticated apple trees adapted to North America E. the original host species in the native region of the disease
Which of the following statements is a testable scientific hypothesis?
A) Antioxidants from food are better than antioxidants from a vitamin pill. B) Eating fish reduces the chance of having a stroke. C) Embryonic stem cell research will allow scientists to find a cure for diabetes. D) Smoking makes people less attractive.