What causes mass extinctions?
What will be an ideal response?
Several reasons have been proposed, including human impact, meteorites, and sudden climate change.
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Which of the following statements does NOT describe characteristics of heterospory?
A. Heterospory involves production of spores on two different parts of the same plant. B. Heterospory involves production of two different kinds of spores, one growing into male gametophytes and the other into female gametophytes. C. Heterospory increases the chance of cross-fertilization. D. Heterospory increases the potential for genetic variation and aids evolutionary flexibility. E. Heterospory only occurs in vascular plants.
In the life cycle of a zygomycete, after the zygospore is formed, the next event will be
A. mitosis. B. meiosis. C. plasmogamy. D. karyogamy. E. dikaryon formation.
When Ron Evans generated transgenic mice in which the gene PPAR-delta was constitutively active (i.e., always expressed), he found that these mice showed a shift from fast glycolytic fibers to slow oxidative fibers. One consequence of this anatomical change would be that the transgenic mice
A. were more likely to become obese than wild-type (nontransgenic) mice. B. had muscles that were not as red as those of wild-type (nontransgenic) mice. C. showed greater endurance in a running test. D. showed less endurance in a running test. E. had leg muscles with lower mitochondrial and capillary densities than wild-type (nontransgenic) mice.
Unlike the one-way movement of an individual in emigration and immigration, migration refers to round-trip movements
Indicate whether the statement is true or false