Question

Where does the sour taste come from in foods such as cheese and yogurt?
lactic acid produced by fermentation
carbon dioxide produced by cellular respiration
ATP produced by the Krebs cycle
ethyl alcohol produced by fermentation

Answer 1

Lactic acid produced by fermentation causes the sour taste

Answer 2

The right answer is lactic acid produced by fermentation

Yogurt is a tart dairy product that is rich in protein and calcium. The lactic acid it contains (from the fermentation of glucose) improves the digestibility of proteins and helps the body to assimilate amino acids and calcium.

This fermentation, from lactic acid, plays a role in cheese making (making Gruyère cheeses).