Which Organism(s) Ferment Milk Lactose, Producing Acids That Curdle the Milk

Question

Which organism(s) ferment milk lactose, producing acids that curdle the milk?
A)Saccharomyces cerevisiae
B)Leuconostoc mesenteroides
C)Streptococcus lactis and Lactobacillus
D)Propionibacterium
E)Spirulina

Accepted Answer

Streptococcus lactis and Lactobacillus are commonly used in the production of fermented dairy products such as yogurt and cheese. These organisms ferment lactose in milk, producing lactic acid which causes the milk to curdle and form a solid mass.