INBDE (Integrated National Board Dental Examination) Practice Exam

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As bacteria grow and biofilm matures, there is a shift from:

  1. Anaerobic gram positive to facultative gram negative

  2. Facultative gram positive to anaerobic gram negative

  3. Anaerobic gram positive to aerobic gram positive

  4. Aerobic gram negative to facultative gram positive

The correct answer is: Facultative gram positive to anaerobic gram negative

As bacteria grow and biofilm matures, there is a shift towards increasingly anaerobic conditions, leading to a shift from facultative gram positive bacteria to anaerobic gram negative bacteria. This shift is due to the increasing availability of oxygen and nutrients within the biofilm, which causes certain bacteria to adapt and thrive in this environment. Option A is incorrect because it describes a shift towards facultative gram negative bacteria, which is the reverse of what is observed. Option C is incorrect because it describes a shift towards aerobic gram positive bacteria, which does not occur as the biofilm matures. Option D is incorrect because it describes a shift towards facultative gram positive bacteria, which is the reverse of what is observed. Therefore, the correct answer is B.

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