Four of the five answers listed below are characteristics of mutations. Select the exception
a. predictable
b. lethal or beneficial
c. random
d. effects depend upon environment
e. heritable
A
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Which is not a hypothesis that attempts to explain the latitudinal diversity gradient?
A. Species in tropical habitats have had longer to evolve and diversify. B. Temperate communities have fewer species due to the need to adapt to a wider range of weather conditions. C. Tropical areas have larger population sizes for a given species. D. A given species in tropical habitats may be more spread out, leaving room in between for others. E. Tropical areas generally have more parasites that may attack particular types of trees, thereby affecting their distribution.
The activation of proteinase inhibitor genes occurs
A. before the systemin moves through the phloem of the plant. B. in the cytoplasm of the affected cells. C. in the nucleus of the affected cells. D. in anticipation of a physical wound to the plant. E. on the plasma membrane of the affected cells.
A stem that cannot increase in diameter is lacking what type of tissue?
A. Protoderm B. Vascular cambium C. Xylem D. Procambium E. Ground meristem
A microbiologist explains to one of her biology classes that her research focuses on the nucleoid region of the cholera bacteria. This means that she is studying a region within the bacterium that contains the
A. R plasmids. B. peptidoglycan. C. nucleic acids. D. nuclear membrane.