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08 Dec 2004, 08:21
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Streptococcus mutans is a bacteria commonly found in the human mouth. This bacteria releases lactic acid, which is the most significant cause of dental cavities. Researchers have developed a genetically modified strain of the bacteria that instead produces an antibiotic that destroys normal strains of the bacteria and permanently replaces them within the mouth. This genetically modified strain could be introduced into the human mouth by a dentist. Clearly, we can expect those who receive it at a young age to get far fewer cavities.
Which of the following, if true, most strengthens the argument?
A. Both strains of Streptococcus mutans feed on sugar found in the mouth.
B. Researchers expect that a single dose of the bacteria would introduce the modified strain into the mouth.
C. Lactic acid causes dental cavities by eroding the enamel on teeth.
D. Most of the lactic acid created in the human mouth comes from the Streptococcus mutans.
E. Patients who receive the genetically modified strain will still have to brush their teeth, in order to remove dental plaques.
Which of the following, if true, most strengthens the argument?
A. Both strains of Streptococcus mutans feed on sugar found in the mouth.
B. Researchers expect that a single dose of the bacteria would introduce the modified strain into the mouth.
C. Lactic acid causes dental cavities by eroding the enamel on teeth.
D. Most of the lactic acid created in the human mouth comes from the Streptococcus mutans.
E. Patients who receive the genetically modified strain will still have to brush their teeth, in order to remove dental plaques.
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08 Dec 2004, 08:38
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I will go with D.
The passage says that Lactic acid causes dental cavity, but what if there are other causes that result in greater secretion of lactic acid than Streptococcus mutans? Injecting the new bacteria will not eliminate the problem. D, addresses this point by saying "Most of the lactic acid created in the human mouth comes from the Streptococcus mutans"
The passage says that Lactic acid causes dental cavity, but what if there are other causes that result in greater secretion of lactic acid than Streptococcus mutans? Injecting the new bacteria will not eliminate the problem. D, addresses this point by saying "Most of the lactic acid created in the human mouth comes from the Streptococcus mutans"
