Examine Figure 41.1c. Which of the following best describes conditions at equilibrium?
A. No water molecules are moving across the
barrier between the two compartments.
B. A net movement of water molecules
continues to add water to the right-hand
compartment.
C. A net movement of water molecules
begins to add water to the left-hand
compartment.
D. Water molecules move randomly across
the barrier with no net addition of water to
either side.
E. None of these choices accurately describe
conditions at equilibrium.
D
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In the figure above, which of the following statements is true?
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De Queiroz's general species concept is receiving significant support because
A. it includes morphology, reproductive isolation, DNA sequences and ecology to determine if a population of group of populations is distinct form other groups. B. multiple criteria are used. C. many scientists believe it is not valid to have so many different species concepts. D. it concurs with evolutionary lineage concept. E. all of the above are correct.
In sporadic (nonhereditary) cancers, mutations occur in ________ cells
A) germ B) somatic C) undifferentiated D) mammary E) T
The upper atmospheric region rich in ozone (O3) that screens out incoming ultraviolet (UV) radiation is called
A. proterozoic region. B. stratosphere. C. ozone layer. D. troposphere. E. radiosphere.