When one portion of a chromosome becomes physically part of another chromosome, the type of mutation is referred to as
A) a nonsense mutation.
B) a translocation.
C) an inversion.
D) a duplication.
E) a nonstop mutation.
Answer: B
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Which statement is true about speciation on island archipelagos?
A. Speciation is slow because it depends on emigration from the mainland. B. Most speciation occurs allopatrically. C. Ecological competition may cause new species to go extinct slowing speciation. D. Speciation by polyploidy is most common. E. Species clusters are less common.
The net direction that an ion or molecule moves is
a. dependent upon the size of the molecule. b. unpredictable because movement is random. c. influenced by the temperature of the medium. d. influenced by the membranes in the vicinity. e. the result of concentration differences.
For every million liters of water in the world, only about ____ liters are in a form that can be used for
human consumption or agriculture. a. 0.6 b. 6 c. 60 d. 600 e. 6,000
In an estuary, the zone of maximum vertical difference in density of water layers is called the
A) thermocline. B) pycnocline. C) mixing zone. D) hypolimnion.