When Ron Evans generated transgenic mice in which the gene PPAR-delta was constituitively 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 change was that the transgenic mice
A. showed greater endurance in a running test.
B. showed less endurance in a running test.
C. had leg muscles with lower mitochondrial and capillary densities than wild-type (nontransgenic) mice.
D. were more likely to become obese than wild-type (nontransgenic) mice.
E. had muscles that were not as red as those of wild-type (nontransgenic) mice.
A. showed greater endurance in a running test.
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