What is bioprospecting?
A. An exploration of nature in the search for potentially useful organisms or their products.
B. A search for unknown organisms that may become serious pathogens to humans.
C. A search for unknown organisms that may become serious pathogens to farm animals.
D. Use of microorganisms to locate and extract valuable minerals from deep underground.
Answer: B
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Telomere shortening puts a limit on the number of times a cell can divide. Research has shown that telomerase can extend the life span of cultured human cells. How might adding telomerase affect cellular aging?
A) Telomerase will speed up the rate of cell proliferation. B) Telomerase eliminates telomere shortening and retards aging. C) Telomerase shortens telomeres, which delays cellular aging. D) Telomerase would have no effect on cellular aging.
The most common infectious disease in humans is ________.
A. dental caries B. diarrhea C. pharyngitis D. the common cold E. gastritis
Marine cartilaginous fishes overcome water loss to their environments by:
a. having specialized chloride cells in their gills that prevent water loss. b. having specialized chloride cells in their gills that continuously excrete salts. c. storing urea in their body fluids, which causes them to be hypertonic to seawater. d. producing very small quantities of urine. e. drinking large quantities of freshwater
In an existing population of plants and mycorrhizae, disease strikes and the mycorrhizae are killed. Which of the following would be impacted? Check all that apply.
A. the supply of organic food to the plant B. the binding of the soil and erosion C. the water supply to the plant D. the availability of mineral nutrients to the plant