Understanding Fermentation

Which type of fermentation is responsible for producing alcoholic beverages?

• Lactic acid fermentation

• Butyric acid fermentation

• Acetic acid fermentation

• Ethyl alcohol fermentation

What did early winemakers unknowingly introduce into the must by stomping grapes with their feet?

• Protozoa

• Bacteria

• Yeast

• Fungi

Who is known as the father of microbiology and observed yeast in beer?

• Antoine Lavoisier

• Charles Cagniard de la Tour

• Joseph Louis Gelusak

• Antony van Leeuwenhoek

What did Louis Pasteur confirm about the fermentation process?

• It does not involve yeast

• It requires oxygen

• It is an aerobic process

• It is an anaerobic process

What type of organism is yeast classified as?

• Eukaryotic

• Viral

• Prokaryotic

• Bacterial

What is the primary food source for yeast during fermentation?

• Proteins

• Lipids

• Glucose

• Starch

What is the process called where glucose is broken down into pyruvic acid?

• Respiration

• Fermentation

• Glycolysis

• Photosynthesis

In the absence of oxygen, what does pyruvic acid convert into within yeast cells?

• Water and oxygen

• Ethanol and carbon dioxide

• Acetic acid

• Lactic acid

What happens to yeast when the ethanol concentration becomes too high?

• It dies off

• It produces more CO2

• It becomes dormant

• It multiplies faster

What is the average ethanol tolerance range for most yeast strains?

• 5-10%

• 20-25%

• 10-15%

• 15-20%