Y8 Video Quiz: Ted-Ed Beneficial Bacteria

What causes bread to be fluffy, Swiss cheese to have holes, and vinegar to be sour?

• Chemical reactions in the ingredients.

• Tiny organisms eating sugar and producing byproducts.

• Special cooking techniques.

• The natural aging process of food.

What type of organism is yeast?

• Bacteria

• Mold

• Single-celled fungi

• Virus

How do yeasts get energy and molecules to function?

• By absorbing sunlight.

• By breaking down carbohydrates like sugar.

• By consuming proteins.

• By drinking water.

What gas produced by yeast gets trapped by gluten to give bread its soft texture?

• Oxygen

• Ethanol

• Carbon dioxide

• Water vapor

Why are oxygen levels kept low during wine making?

• To prevent the wine from freezing.

• To encourage yeast to produce more alcohol through fermentation.

• To make the wine sweeter.

• To kill off unwanted bacteria.

What happens to the alcohol level in wine as yeast consume sugar in the grape juice?

• It decreases.

• It stays the same.

• It rises.

• It first decreases then rises.

How is carbon dioxide kept in carbonated alcoholic beverages like champagne and beer?

• By adding special chemicals.

• By using sealed containers during fermentation.

• By freezing the beverage.

• By removing all oxygen.

What do acetic acid bacteria convert ethanol into when oxygen is present?

• Sugar

• Water

• Acetic acid

• Carbon dioxide

What do bacteria produce in milk that causes its proteins to curdle during cheese making?

• Ethanol

• Carbon dioxide

• Lactic acid

• Rennet

What causes the characteristic holes in Swiss cheese?

• Air bubbles trapped during pressing.

• A special enzyme added during production.

• A species of bacteria that emits carbon dioxide.

• The natural aging process of the cheese.