A(n) ____ is the transition zone where two ecosystems meet and intergrade
a. intertidal zone
b. ecotone
c. range
d. biome
e. thermocline
b
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One of the reasons study of nitrogen use in plants is of special interest is because:
A. Nitrogen is limited in our atmosphere. B. Nitrogen in its atmospheric form is not useable by plants. C. Nitrogen is often toxic to plants. D. None of the forms of nitrogen are easily absorbed by plants. E. Nitrogen is not an essential element for plant growth.
Which of the following exhibit phagocytic activity?
A. lymphocytes B. macrophages C. neutrophils D. lymphocytes and macrophages E. macrophages and neutrophils
What percentage of cancers are known to be virus-induced?
a) 10% b) 25% c) 50% d) 100%
Dozens of different types of fats exist in nature; what groups these molecules together is that all _____.
A) contain stearic acid B) can be found in the membranes of animal cells C) contain oleic acid D) are solid at room temperature E) contain glycerol bonded to at least one fatty acid