1. What ancient civilization is credited with first using yeast in food and beverages?
2. What vitamin naturally occurs in yeast extract?
A. Vitamin B12
3. What do Parmesan cheese, tomatoes and peas have in common with yeast extract?
A. They all contain glutamic acid
4. Which U.S. government agency has certified yeast extract as safe?
A. The Food and Drug Administration
5. What British product made from yeast extract does chef Nigella Lawson consider one of ten essential ingredients in her kitchen?