Get detailed explanations to advanced GMAT questions.
Healthy lungs produce a natural antibiotic that protects them from infection by routinely killing harmful bacteria on airway surfaces. People with cystic fibrosis, however, are unable to fight off such bacteria, even though their lungs produce normal amounts of the antibiotic. The fluid on airway surfaces in the lungs of people with cystic fibrosis has an abnormally high salt concentration; accordingly, scientists hypothesize that the high salt concentration is what makes the antibiotic ineffective.
Which of the following, if true, most strongly supports the scientists’ hypothesis?
When the salt concentration of the fluid on the airway surfaces of healthy people is raised artificially, the salt concentration soon returns to normal.
A sample of the antibiotic was capable of killing bacteria in an environment with an unusually low concentration of salt.
When lung tissue from people with cystic fibrosis is maintained in a solution with a normal salt concentration, the tissue can resist bacteria.
Many lung infections can be treated by applying synthetic antibiotics to the airway surfaces.
High salt concentrations have an antibiotic effect in many circumstances.
Option C is the right answer.
Question type: Strengthen the Argument
A) This option only talks about salt concentration. This doesn’t talk about the effect on the antibiotic.
B) We are worried about high concentrations of salt and its effect on antibiotics. This option doesn’t talk about the same.
C) Correct Answer
D) The option doesn’t talk about synthetic antibiotics.
E) This is a very generalized answer. Doesn’t serve our purpose.
- Fossils of a whale that beached on an African shore more than a million years ago and…
- Appendicitis (inflammation of the appendix) is potentially fatal; consequently, patients with symptoms strongly suggesting appendicitis almost have their…
- Many entomologists say that campaigns to eradicate the fire ant in the United States have failed because the chemicals that…
- Since February, the Federal Reserve has raised its short-term interest rate target five times, and because of the economy’s…
- From 1980 to 1989, total consumption of fish in the country of Jurania increased by 4.5 percent, and total consumption of poultry products there increased by 9.0 percent..