Recent advances in molecular techniques allowed paleobiologists to sequence DNA that was preserved in a woolly
mammoth that died ____ years ago.
a. 27,000
b. 4,000
c. 2,700
d. 1,000
e. 500
ANSWER: a
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The effects of elevated atmospheric CO2 concentrations
A. have the potential to alter the nutritional status of plants. B. have the potential to allow herbivores to eat less plant matter. C. have no effect on nutrient levels found in plant leaves. D. allow the plant to use O2 more efficiently in photosynthesis. E. cause an increase in rubisco production.
Which membranes occur in paired sheets?
a. synovial b. cutaneous c. mucous d. serous e. basement
The incidence of tuberculosis in the year 2000 in the United States was 12.43/100,000 cases. This means
A. 12.43 of every 100,000 people in the United States had tuberculosis in the year 2000. B. 12.43 of every 100,000 people died of tuberculosis in the United States in the year 2000. C. there were 12.43 new cases of tuberculosis for every 100,000 people in the United States in the year 2000. D. there were 12.43 tubercle bacilli per 100,000 microbes in the United States in the year 2000. E. 12.43 of every 100,000 cases of tuberculosis were treated in the United States in the year 2000.
The two common vectors used to transfer a piece of DNA into a cloning host are ________ and ________.
Fill in the blank(s) with the appropriate word(s).