Discussion
Which of the following organisms get energy only by fermentative metabolism ?
Answer: A
The organism that gets energy only by fermentation is Lactobacillus bulgaricus.
Lactobacillus delbrueckii subsp. bulgaricus, the yoghurt bacterium, is an aerotolerant anaerobe. It lacks cytochromes and an electron transport chain, so it cannot respire even in air. It makes its ATP by substrate-level phosphorylation, fermenting lactose to lactic acid.
Bacillus subtilis is a respiring bacterium that can use oxygen and, under some conditions, nitrate. E. coli is a facultative anaerobe that respires when oxygen is present and ferments only without it. Pseudomonas putida is a strict aerobe that depends on respiration.
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