The radioactive decay of carbon-14 can be used to determine
a. relative dating.
b. absolute dating.
c. mutation rates.
d. plate tectonics.
e. extinction rates.
B
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Which of the following groups of microorganisms produces antibiotics?
A. Penicillium B. Streptomyces C. Bacillus D. Penicillium AND Streptomyces E. All of the choices are correct.
A positive feedback loop is one that tends to amplify a process. Why would the effect of deforestation on the water cycle be considered a positive feedback loop?
A. Because deforestation leads to reduced nutrient uptake during the growing season, which results in more fertile soil. B. Because deforestation leads to new types of habitat which leads to greater species diversity. C. Because deforestation leads to an increase in the concentration of nutrients in run off, which then leads to eutrophication. D. Because deforestation leads to a decrease in precipitation, which results in further loss of vegetation.
What adaptations did ancient algae have to achieve as they washed ashore and evolved into the more advanced land plants we see today?
What will be an ideal response?
Which of the following is not true about the interaction of biofilms on teeth?
A) Brushing teeth twice daily and flossing will physically remove superficial plaque layers. B) Bacterial growth within deeper biofilm layers and new bacteria entering the mouth quickly reestablish what was removed from brushing. C) Limiting dietary fats reduces lactic acid production by the bacteria in dental plaque and decreases the risk for dental caries, D) When plaque calcifies into tartar it must be scraped off the teeth. E) Dentists recommend a twice-yearly dental cleaning and checkup to limit caries and periodontal disease,