Which of the following food web properties is independent of the species richness of the community?
A) number of feeding links per species
B) number of trophic levels
C) number of guilds within trophic levels
D) overall food web complexity
Ans: A) number of feeding links per species
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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. showed less endurance in a running test. C. showed greater endurance in a running test. D. had leg muscles with lower mitochondrial and capillary densities than wild-type (nontransgenic) mice. E. had muscles that were not as red as those of wild-type (nontransgenic) mice.
Sturtevant's detailed mapping studies of the X chromosome of Drosophila supported what genetic principle?
A) That genes are arranged in a linear order on the chromosomes. B) That genes are carried on chromosomes. C) That sex determination is controlled by the X and Y chromosomes. D) That segregation of an allelic gene pair is accompanied by disjunction of homologous chromosomes. E) That different pairs of chromosomes assort independently.
A plaque is
A) a colony of bacteria growing on a plate. B) a clump of bacterial cells that contain phage within them. C) a region on a plate where bacteria that have survived phage infection are living. D) an area on a plate that has live phage-resistant bacteria. E) an area on a plate that has phage and dead bacteria.
The loudest sounds a nurse hears while listening to a patient's heart through a stethoscope are caused by
A. closing of the AV valves. B. opening of the semilunar valves. C. depolarization of the ventricles. D. contraction of the atria. E. contraction of the ventricles.