Which type of acidic fermentation produces mixed acid products?

• A. Propionic acid fermentation
• B. Lactic acid fermentation
• C. Butanediol fermentation
• D. Mixed acid fermentation

Answer: (D)

Verified step by step guidance

1. Understand that fermentation types are classified based on the main acidic or neutral end products they produce during anaerobic metabolism.
2. Recognize that mixed acid fermentation is characterized by the production of a mixture of acids such as lactic acid, acetic acid, succinic acid, and formic acid, rather than a single dominant acid.
3. Recall that propionic acid fermentation primarily produces propionic acid, lactic acid fermentation mainly produces lactic acid, and butanediol fermentation produces neutral compounds like 2,3-butanediol.
4. Identify that the question asks specifically for the fermentation type that produces mixed acid products, which matches the description of mixed acid fermentation.
5. Conclude that the correct answer is mixed acid fermentation because it uniquely produces a combination of multiple acidic end products rather than a single acid or neutral compounds.