9. Pseudomonas aeruginosa cannot utilize any of the carbohydrates used in this experiment, yet turbidity was observed in the tube. What alternative carbon source was used as a nutrient by this organism

The correct answer is - amino acid.

Explanation:

If some organism can not utilize lactose or other carbohydrates, have to solely depend on proteins, an amino acid in a media. Pseudomonas aeruginosa, a non-fermenter is a perfect example of such an organism.

P. aeruginosa is not able to use carbohydrates therefore they use amino acid which causes turbidity in the experiment and deamination leads to form a weak base NH3 that makes medium alkaline.

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