Study guide 4[1]

Study guide 4[1] - Study guide 4 1 Explain why...

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Study guide 4 1. Explain why heterofermentative lactic acid bacteria generate much more CO 2 than homofermentative lactic acid bacteria when glucose is used as the carbon source. Heterofermentative lactic acid bacteria will produce a number of products such as lactic acid, volatile acids, and CO2 from carbohydrate. Homofermentatice lactic acid bacteria produces one each product. Heterofermentative bacteria are able to produce CO2 in each reaction while Homofermentative bacteria can only produce CO2 or lactic acid or any volatile acid during that reaction. Heterofermentative bacteria are constantly producing CO2 while homofermentative bacteria are only sometimes producing bacteria when glucose is used as a carbon source. 2. If a species of homofermentative lactic acid bacteria and a species of heterofermentative lactic acid bacteria were separately grown on a well-buffered medium with the same initial concentration of glucose, which LAB would probably grow to the higher population number and why? Homofermentative LAB would be able to utilize more glucose for growth more efficiently by only having to produce lactic acid as its only by-product. Heterofermentative LAB would probably move at a slowly less optimum rate since the by-products of acetic acid, CO2, and lactic acid would contribute to lowering the pH at a faster rate. 3. Prof. Eiteman’s daughter's pediatrician advises that she consume plenty of yogurt during and after her antibiotic treatment for a bacterial sinus infection. Why did the doctor suggest doing this? Although E. coli can be made to accumulate a high concentration of lactic acid, why might this organism not be as economic as Lactobacillus spp. for the commercial manufacture of lactic acid? After antibiotic treatment, the body’s GI normal flora of bacteria will be low. Eating yogurt with live cultures, a probiotic, will help re-establish the body’s normal flora. Having the “good bacteria” no longer dominating could be an opportunistic time for pathogenic bacteria to colonize and make you sick. Lactobacillus spp. are not pathogenic and are the most common flora of the GI tract. E. coli is present in the GI tract but some of its strains are indeed pathogenic. Lactobacillus keeps E. coli in check by dominating it in the GI tract. . 4. What characteristics of a microorganism would make it favorable for the commercial production of some biochemical? You should be able to come up with eight. 1.
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2. 3. 4. 5. 6. 7. 8. 5. Why is the anaerobic degradation of aromatic compounds of interest? Name an environment where this process is very important to human health. Anaerobic degradation can breakdown harmful wastes to turn them into renewable energy. This is especially important process in wastewater treatment facilities. 6.
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Study guide 4[1] - Study guide 4 1 Explain why...

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