A probiotic is a live microorganism that is claimed to confer a health benefit by altering the indigenous microflora of the intestinal tract. Which…
A probiotic is a live microorganism that is claimed to confer a health benefit by altering the indigenous microflora of the intestinal tract. Which one of the following bacteria has been used widely in probiotics?
Select an option to attempt
Correct Answer: Option C
Explanation
Lactobacillus lactis in the GI tract:Lactobacillus lactis is a Gram-positive, lactic acid bacterium widely used in:• Fermented dairy products (yogurt, cheese, buttermilk)• ProbioticsIn the GI tract:• Colonises the intestinal mucosa and competes with pathogens for adhesion sites and nutrients.• Produces lactic acid → lowers local pH → inhibits growth of pathogenic bacteria.• Produces bacteriocins (e.g., nisin) that kill other bacteria.• Stimulates mucosal immune responses.Health benefits:• Reduces incidence of antibiotic-associated diarrhea• May reduce risk of colorectal cancer• Improves lactose toleranceAnswer: Lactobacillus lactis colonises the GI tract beneficially, producing lactic acid to inhibit pathogens.