In the summer, a lake’s thin layer of water beneath the top layer where the temperature drops rapidly is known as the
____.
a. halocline
b. thermocline
c. pycnocline
d. hypocline
e. hypercline
ANSWER: b
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Which of the following analogies best fits the manner in which amino acids form proteins? a. A limited selection of bricks can be put together in an infinite variety of architectural styles
b. Many identical pearls are strung together to form one necklace. c. Each student in a university is unique but they all belong to the same organization. d. A child links four colors of plastic beads together in a repeating pattern.
Soil Consists of:
a. rock particles of various sizes b. minerals c. microorganisms d. organic matter from dead organisms e. All of the above
Nitrogen-fixing bacteria convert ____ to ____, which is a form of nitrogen that plants can use.
A. nitrogen gas; ammonia B. ammonia; nitrogen gas C. nitrogen gas; nitrates D. nitrogen gas; nitrites E. ammonia; nitrates
In Whittaker's system, the protozoa and algae are classified in the kingdom
A. Plantae. B. Animalia. C. Protista. D. Monera. E. Mycetae.