rather due to protein denaturation which eventually leads to cell death hence

Rather due to protein denaturation which eventually

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rather due to protein denaturation which eventually leads to cell death, hence the absence of growth (Price & Sowers, 2004) 2. What is the role of atmospheric oxygen in metabolic pathways of microorganisms? Bacteria can be classified into anaerobic, aerobic, or facultative depending on the types of reactions they exhibit with oxygen to generate energy for growth and other activities. In their metabolism of energy-containing compounds, aerobes need oxygen as an electron acceptor. Therefore, no growth of aerobic organisms can be observed in the absence of oxygen. Anaerobes, on the other hand, cannot grow in the presence of oxygen, which in some cases toxic for them. Therefore, they depend on other substances as electron acceptors. Meanwhile, facultative organisms are versatile wherein they prefer to utilize oxygen as an electron acceptor, but they also have the capacity to metabolize even without oxygen (Hentges, 1996). 3. Based on your results, discuss how microbial growth is affected by varying levels of salt and sugar. Based on the results obtained, varying levels of salt and sugar had similar effects on microbial growth. Albeit inconsistent, majority of the data have revealed salt and glucose to have inhibiting effects on microbial growth. These substances’ antimicrobial mechanisms may be linked with their interference with the microbe’s enzyme activity (Price & Gallant, 1983). References Hentges, D. (1996). Aerobes: General Characteristics. In Medical Microbiology 4th ed. University of Texas Medical Branch: Galveston. Price, P. B., & Sowers, T. (2004). Temperature dependence of metabolic rates for microbial growth, maintenance, and survival. Proceedings of the National Academy of Sciences , 101 (13), 4631–4636. doi: 10.1073/pnas.0400522101 Price, V. L., & Gallant, J. A. (1983). The Glucose Effect in Bacillus subtilis. European Journal of Biochemistry , 134 (1), 105–107. doi: 10.1111/j.1432-1033.1983.tb07537.x
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