To explain: The fact that the Escherichia coli gives positive result, whereas Enterobacter aerogenes gives a negative result in the methyl-red test even though both produce acid and gas as end products in carbohydrate fermentation test.
Introduction: The methyl-red test is used to detect whether the organism produces an acidic end product or not. Methyl red is the indicator used. The major substrate used by the enteric organisms is glucose. However, the end products will vary based on the enzymatic pathway of the organism. Even though glucose is fermented by all the organisms with organic acid production, this test mainly separates E. coli and E. aerogenes.
Trending nowThis is a popular solution!
Chapter 5 Solutions
Microbiology: A Laboratory Manual (11th Edition)
- Human Anatomy & Physiology (11th Edition)BiologyISBN:9780134580999Author:Elaine N. Marieb, Katja N. HoehnPublisher:PEARSONBiology 2eBiologyISBN:9781947172517Author:Matthew Douglas, Jung Choi, Mary Ann ClarkPublisher:OpenStaxAnatomy & PhysiologyBiologyISBN:9781259398629Author:McKinley, Michael P., O'loughlin, Valerie Dean, Bidle, Theresa StouterPublisher:Mcgraw Hill Education,
- Molecular Biology of the Cell (Sixth Edition)BiologyISBN:9780815344322Author:Bruce Alberts, Alexander D. Johnson, Julian Lewis, David Morgan, Martin Raff, Keith Roberts, Peter WalterPublisher:W. W. Norton & CompanyLaboratory Manual For Human Anatomy & PhysiologyBiologyISBN:9781260159363Author:Martin, Terry R., Prentice-craver, CynthiaPublisher:McGraw-Hill Publishing Co.Inquiry Into Life (16th Edition)BiologyISBN:9781260231700Author:Sylvia S. Mader, Michael WindelspechtPublisher:McGraw Hill Education