Is E. coli indole positive?
Understand the Problem
The question is asking whether E. coli (Escherichia coli) is capable of producing indole, which is a byproduct of the breakdown of the amino acid tryptophan. This is a classification question related to microbiology.
Answer
E. coli is indole positive.
E. coli is indole positive.
Answer for screen readers
E. coli is indole positive.
More Information
Approximately 96% of Escherichia coli strains are indole positive, making this a common diagnostic marker to differentiate E. coli from other enterobacteria.
Tips
One common mistake is to assume all E. coli are indole positive without considering the small percentage that may test negative.
Sources
- Indole Test - American Society for Microbiology - asm.org
- Indole Can Act as an Extracellular Signal in Escherichia coli - NCBI - ncbi.nlm.nih.gov
- Indole test - Wikipedia - en.wikipedia.org
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