Microbiology
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The M. pneumoniae, which can cause walking pneumonia, is resistant to penicillin due to the absence of a cell wall. Which of the following is, therefore, true?
The strain acquired resistance due to misuse of penicillin.
The strain developed resistance over time upon exposure to penicillin.
The strain has intrinsic resistance to penicillin.
The strain has mutated acquiring resistance to penicillin.