Questions: 3. If a bacterium tested positive for both PR-dextrose and PR-lactose, it must be capable of using what two substances as the main carbon source?

3. If a bacterium tested positive for both PR-dextrose and PR-lactose, it must be capable of using what two substances as the main carbon source?
Transcript text: 3. If a bacterium tested positive for both PR-dextrose and PR-lactose, it must be capable of using what two substances as the main carbon source?
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Solution

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The bacterium tested positive for both PR-dextrose and PR-lactose, indicating that it must be capable of using dextrose (glucose) and lactose as the main carbon sources.

Explanation:

  • PR-dextrose (Phenol Red Dextrose) test: A positive result indicates that the bacterium can ferment dextrose (glucose) and produce acid, which changes the color of the phenol red indicator.
  • PR-lactose (Phenol Red Lactose) test: A positive result indicates that the bacterium can ferment lactose and produce acid, which also changes the color of the phenol red indicator.

Therefore, the bacterium can utilize both dextrose (glucose) and lactose as carbon sources.

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