Respuesta :
Propionibacterium acnes look like rods in gram-positive microscopic examination thus the correct answer is option (E).
Among all species, Propionibacterium freudenreichii is the most significant. These are anaerobic gram-positive bacteria that only exist in cheese. This bacteria's primary job is to help starter bacteria break down lactate into propionate, acetate, and carbon dioxide in Swiss cheese varieties including Emmental and Comte. Propionic acid can be produced by whey fermentations employing ssp. Shermanii strains and is utilized as a fungicidal agent in the production of bread and bakery goods. Typically, whole whey is used, and the fermentation must happen in sterile conditions at a temperature of about 30 °C and a pH range of 6.5 to 7.5. Supplemental feeding boosts the formation of propionate, and after 60–70 hours, a normal yield of about 40% lactose fermentation is attained. To extract a powder containing acid and whey proteins, the culture fluid is sprayed onto a dried form of the material. The bacteria can cause acne in humans with pus-filled cysts.
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