Answer :

Final answer:

Pseudomonas aeruginosa is a gram-negative microorganism with characteristic signs of darkening and fruity odor due to the production of pyocyanin and pyoverdin pigments. It is an opportunistic bacterium that can cause infections in wounds.


Explanation:

The gram-negative microorganism with characteristic signs of darkening and fruity odor is Pseudomonas aeruginosa. P. aeruginosa is an opportunistic bacterium that can cause infections in wounds. It produces pigments pyocyanin and pyoverdin, which contribute to its virulence and give it a blue-green color. The odor is caused by a compound called 2-aminoacetophenone.


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