16. The passage is primarily concerned with attempts to determine
the role of siderophores in the synthesis of serum iron.
new treatment for infections caused by A. hydrophilia.
the function of fever in warm-blooded animals.
the mechanisms that ensure constant body temperature.
iron utilization in cold-blooded animals.
17. According to the passage, Garibaldi determined which of the following? That serum iron is produced through microbial synthesis.
That microbial synthesis of siderophores in warm-blooded animals is more efficient at higher temperatures.
That only iron bound to other substances can be used by bacteria.
That there is a relationship between the synthesis of siderophores in bacteria of the genus Salmonella
and environmental temperatures.
That bacteria of the genus Salmonella
require iron as a nutrient.
18. Which of the following can be inferred about warm-blooded animals solely on the basis of information in the passage? The body temperatures of warm-blooded animals cannot be easily controlled in the laboratory.
Warm-blooded animals require more iron in periods of stress than they do at other times.
Warm-blooded animals are more comfortable at an environmental temperatures of 37 degrees than they are at a tempterature of 42 degrees.
In warm-blooded animals, bacteria are responsible for the production of siderophores, which, in turn, make iron available to the animal.
In warm-blooded animals, infections that lead to fever are usually traceable to bacteria.
19. If it were to be determined that "similar phenomena occur in warm-blooded animals" (lines 21-22), which of the following, assuming each is possible, is likely to be the most effective treatment for warm-blooded animals with bacterial infection? Administering a medication that lowers the animals' body temperature.
Injecting the animals with an iron solution.
Administering a medication that makes serum iron unavailable to bacteria.
Providing the animals with reduced-iron diets.
Keeping the animals in an environment with temperatures higher than 37 degrees Celcius.
20. In Kluger's experiment with Iguanas, the passage supports which of the following about why the animals at 42 degrees died when injected with an iron solution? Because the healty Iguanas prefer lower temperature than 42 degrees.
Because the lethal bacterium A. hydrophilia
multiplies rapidly at higher temperatures than at lower temperatures.
Because, although higher temperatures make it difficult for the invading bacterium to acquire iron through synthesis and multiply, the injected iron solution fed the bacteria and allowed them to multiply, killing the animals.
Because Iguanas are warm-blooded and cannot tolerate higher levels of serum iron.
Because the bacterium of the genus A. hydrophilia
is more lethal than bacterium of the genus Salmonella
.