Multiple choice

Which kind of microorganisms turns milk into yogurt?

  1. yeast

  2. algae

  3. bacteria

  4. phytoplanton

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Bacteria, specifically lactic acid bacteria like Lactobacillus, ferment the lactose in milk into lactic acid. This acid lowers the pH, causing the milk proteins to coagulate and thicken into yogurt. Yeast, algae, and phytoplankton do not perform this specific fermentation process for yogurt production.