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Practice Reading: Multiple Choice, Multiple Answers ID: #34777 Mutans
Instructions ›
Read the text and answer the question by selecting all the correct responses. You will need to select more than one response.
The typical human mouth contains a writhing array of bacteria. The majority of these microscopic organisms are beneficial but on a particular type creates a problem that is Streptococcus Mutants. This bacterium thrives on the sugar present in the mouth; ever consume it while excreting lactic acid. The majority of tooth decay cases in humankind are because of this acid as it erodes the enamel and dentin of the teeth. A Florida-based company called organics may have found a way to rid our mouths of this acid. excreting organisms for good. This would make cavities a thing of the past, and put no small number of dentists out of business. There is potential for disaster despite the obvious benefits. Organics’ approach to stopping tooth decay is understanding; they have used recombinant DNA technology to produce a new array of Streptococcus Mutans which does not excrete lactic acid. Instead, I excrete tiny amounts of an agent called Mutacin 1140 which is deadly to other strains of Streptococcus Mutans, giving these new bacteria an edge over the existing organisms. Once the modified bacteria get a place in the mouth, the existing population if approved as a treatment, a single visit to the dentist would be all that is obligatory. The patient’s teeth would be swabbed with the modified bacteria for five minutes, allowing it to begin its work.

What is true according to the passage?

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Option 3: "There is potential for disaster despite the obvious benefits"

Explanation: This option is correct as the text explicitly states that there is potential for disaster despite the obvious benefits of the new treatment. This aligns with the overall theme of caution regarding the new technology.

Option 1: "Bacterium thrives on the sugar present in the stomach"

Explanation: This option is incorrect because the text specifically states that the bacterium thrives on sugar present in the mouth, not the stomach. This is a clear contradiction to the information provided in the text.

Option 2: "Cavities are a thing of the past"

Explanation: This option is incorrect as the text mentions that cavities could become a thing of the past if the new treatment is approved, but it does not state that they currently are. Therefore, this statement is misleading and not supported by the text.

Option 4: "The minority of these microscopic organisms are beneficial"

Explanation: This option is incorrect because the text states that the majority of the microscopic organisms in the mouth are beneficial, not the minority. This is a direct contradiction to the information provided.

Option 5: "DNA technology can produce a new array of Streptococcus Mutans which does not excrete lactic acid"

Explanation: This option is correct as the text describes how DNA technology is used to produce a new strain of Streptococcus Mutans that does not excrete lactic acid. This is directly supported by the information in the text.

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