NURSING ANM AND GNM

NURSING EXAM QUESTIONS

MICROBIOLOGY

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
The principal microorganism for yogurt is
A
Streptococcus thermophilus
B
Leuconostoc citrovorum
C
Lactobacillus acidophilus
D
None of these
Explanation: 

Detailed explanation-1: -Yogurt is a semisolid fermented milk product obtained by the action of specific lactic acid bacteria (Streptococcus thermophilus and Lactobacillus delbrueckii subsp. bulgaricus) when added to heat-treated milk.

Detailed explanation-2: -Streptococcus thermophilus is a Gram positive bacterium widely used in dairy fermentations for the production of yogurt and cheese. In contrast with other lactic acid bacteria, the probiotic status of S. thermophilus remains still questioned.

Detailed explanation-3: -thermophilus can rapidly convert lactose into lactic acid, which causes a rapid reduction in pH resulting in coagulation of milk proteins (casein). In addition, this bacterium confers many excellent processing properties to the yogurt, such as flavor, acidity, viscosity, and water holding capacity (Sun et al., 2011).

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