Question

Lactobacillus mediated conversion of milk to curd results because of
A) Coagulation and partial digestion of milk fats.
B) Coagulation and partial digestion of milk proteins
C) Coagulation of milk proteins and complete digestion of milk fats
D) Coagulation of milk fats and complete digestion milk protein.

Answer 1

Hint:Many microorganisms are there that are involved in the production of beverages, dairy products, and fermented products. Lactobacillus is one of them that is involved in the production of dairy products.

Complete answer:
To answer this question, we should first understand about the lactobacillus. Lactobacillus is a gram-positive anaerobic bacterium. They are non-spore forming and rod-shaped bacteria. They are the lactic acid forming bacteria that are found in dairy products. Lactobacilli do not cause harm to our guts therefore, we can consume dairy products that produce in the presence of lactobacillus because of this reason they are called the friendly bacteria. They can help in break-down of food, fight against unfriendly bacteria, and absorb the nutrients. But sometimes we get harm with these friendly bacteria also as in some rare cases people get lactose intolerance disease like endocarditis in which the digestive system cannot digest the lactose and causes vomiting and stomach ache like system.
Now, the conversion of milk into curd takes place in the presence of lactic acid bacteria that is the lactobacillus. It converts lactose sugar milk into lactic acid, this causes the coagulation and partial digestion of milk protein called casein. Not only curd formation yoghurt, cheese, and other dairy products are also produced through this process.

Hence, the correct answer is ‘B’. Coagulation and partial digestion of milk proteins.

Note:Other than lactobacillus there are many other friendly bacteria that are found inside our guts like klebsiella sp. Staphylococcus aureus, etc . The friendly bacteria are also termed as probiotics; they are involved in the digestion process and do not cause harm to the stomach.