In 2006, the U.S. generated __________ tons of
trash.
a. 22 billion
b. 251 million
c. 29 million
d. 200 million
e. none of these
Answer: b
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Replacing sodium with potassium can satisfy the requirement for sodium in the halobacteria
Indicate whether the statement is true or false.
A ribozyme catalyzes a reaction on itself and actually changes shape. This is an example of.
A. intra-enzyme reactions. B. intramolecular catalysis. C. inter-enzyme reactions. D. intermolecular catalysis.
Which of the following is true of prokaryotes?
A. Prokaryotes have a nucleus. B. Prokaryotes are single-celled. C. Prokaryotes do not have a chromosome. D. Prokaryotes have membrane-bounded organelles. E. Prokaryotes do not have ribosomes.
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.