Gram positive rods give gray colony color:
- a. Bacillus anthraces***
- b. E.coli
- c. Shigella
- d. Mycobacterium
- e. Non.
The answer is e. Non.
While some gram-positive rods can indeed display a variety of colony colors (including some shades of gray), it's not a defining characteristic for all of them. The specific color depends on many factors, including the bacterial species, growth medium, incubation conditions, and even age of the colony.
Here's a breakdown of the options:
- Bacillus anthracis:
While gram-positive rods, their colonies are typically off-white, beige, or even brown depending on the medium.
- E. coli:
Gram-negative, so not applicable.
- Shigella:
Also gram-negative.
- Mycobacterium:
These are gram-positive rods, but can show a wide range of colony colors including yellow, orange, red, and yes, even some grays. However, it's not a consistent feature for all Mycobacterium species.
Therefore, relying solely on colony color and gram-positive rod morphology wouldn't be enough to accurately identify any of these specific bacteria. Additional tests and analyses would be necessary.
Remember, always prioritize proper laboratory diagnostics for accurate bacterial identification.
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