Streptococci obtain energy from fermentation of sugars to which acid?

Streptococci obtain energy from fermentation of sugars to which acid?

• A. Formic acid
• B. Succinic acid
• C. Lactic acid
• D. Valeric acid

Answer: (C)

Streptococci generate energy by fermenting sugars through glycolysis and then converting pyruvate to lactate to regenerate NAD+. This lactic acid fermentation is the main pathway for these organisms, so lactic acid becomes the primary end product. The production of lactic acid acidifies the surrounding environment, which is relevant in contexts like dental plaque where streptococci contribute to caries. Other acids are produced by different bacteria or pathways, but the hallmark end product for streptococcal sugar fermentation is lactic acid.

Streptococci generate energy by fermenting sugars through glycolysis and then converting pyruvate to lactate to regenerate NAD+. This lactic acid fermentation is the main pathway for these organisms, so lactic acid becomes the primary end product. The production of lactic acid acidifies the surrounding environment, which is relevant in contexts like dental plaque where streptococci contribute to caries. Other acids are produced by different bacteria or pathways, but the hallmark end product for streptococcal sugar fermentation is lactic acid.