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.
Answer: C
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Imagine you were the manager of a national park with cheetahs. The cheetahs feed primarily on gazelles, while the gazelles eat grass. It takes an acre of grassland to feed one gazelle, and it takes ten gazelles to feed one cheetah. You have a maximum of ten cheetahs when the system is functioning optimally. You would like to increase the cheetah population because people pay money to see the cheetahs. How much grassland do you need to double the cheetah population supported by this grassland?
A. 10 acres B. 500 acres C. 200 acres D. 100 acres
Which nutrients can plants obtain through mycorrhization?
a. calcium, nickel, and nitrogen b. phosphate, zinc, and copper c. phosphorus, calcium, and oxygen d. hydrogen, carbon, and oxygen
Which of the following is not an adaptation for flight in marine birds:
1.ectothermic 2.high metabolic rate 3.advanced respiratory system 4.keen senses
Loss of a chromosome segment is called a(n)
a. translocation. b. inversion. c. deletion. d. substitution.