The given question is incomplete. The complete question is:
Question: When microorganisms in milk produce acid under certain conditions, yogurt results. Which of these processes would you expect to be key in the production of yogurt?
A. Kreb's cycle
B. Photosynthesis
C. Lactic acid fermentation
D. Alcohol fermentation
Answer:
C. Lactic acid fermentation
Step-by-step explanation:
Milk is converted into yogurt as the lactic acid fermenting bacteria convert the lactose of milk into lactic acid. Lactose sugar has galactose and glucose subunits. These bacteria anaerobically breakdown lactose into the simpler sugars which then enter the process of glycolysis. Glycolysis breakdown of glucose produces pyruvate. Oxidation of pyruvate into lactic acid converts the milk into yogurt. Lactobacillus species are mainly responsible for yogurt formation.