Gram-negative organisms are found in the intestinal flora of many species.

Gram-negative organisms are found in the intestinal flora of many species.

• A. True
• B. False
• C. Not sure
• D. Both true and false

Answer: (A)

Many species harbor a diverse intestinal microbiota that includes Gram-negative bacteria. In the gut you’ll find familiar residents such as Escherichia coli and Bacteroides species, among others. These organisms are common across mammals and many animals, often existing as commensals that help with digestion, nutrient processing, and protection against invaders. The presence of Gram-negative bacteria in the intestinal flora is a normal, widespread feature, which makes the statement true. While some Gram-negative bacteria can cause illness if the balance of the gut ecosystem is disrupted, that doesn’t change their usual presence in healthy intestinal flora.

Many species harbor a diverse intestinal microbiota that includes Gram-negative bacteria. In the gut you’ll find familiar residents such as Escherichia coli and Bacteroides species, among others. These organisms are common across mammals and many animals, often existing as commensals that help with digestion, nutrient processing, and protection against invaders. The presence of Gram-negative bacteria in the intestinal flora is a normal, widespread feature, which makes the statement true. While some Gram-negative bacteria can cause illness if the balance of the gut ecosystem is disrupted, that doesn’t change their usual presence in healthy intestinal flora.