Evolutionarily, the jaws of vertebrates developed from:
A. the circular mouth of lampreys
B. the last pharyngeal arch of jawless fishes
C. the third pharyngeal arch of jawless fishes
D. the operculum
E. the claspers
C. the third pharyngeal arch of jawless fishes
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Semiconservative replication involves a template. What is the template?
A) single-stranded binding proteins B) DNA polymerase C) one strand of the DNA molecule D) an RNA molecule
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 commensal bacterium
A) does not receive any benefit from its host. B) is beneficial to its host. C) may also be an opportunistic pathogen. D) isn't capable of causing disease in its host. E) always causes disease in its host.
What mechanism explains why polar bears are white and bears found farther south have a darker color?
A. continental drift B. inheritance of acquired characteristics C. the common genetic language D. natural selection