Nutrition

Question 1

What are 3 macro elements required for yeast growth?

Answer 1

Carbon
Hydrogen
Oxygen
Nitrogen
Phosphate
Potassium
Sodium
Zinc
Magnesium

Question 2

What percentage of yeast cell weight is protein?

Answer 2

35-65

Question 3

What percentage of yeast cell weight are polysaccharides?

Answer 3

20-40

Question 4

What are some yeast nutrients found in wort?

Answer 4

Carbohydrate (fermentable sugars)
Nitrogen (amino acids)
Inorganic (P, S, Mg)
Vitamins
Oxygen

Question 5

What is the best course for nitrogen in wort?

Answer 5

Amino acids (FAN or YAN)

Question 6

How does calcium affect brewing?

Answer 6

Lowers wort ph
Oxalate precipitation
Yeast flocculation
Alpha Amalyse

Question 7

How does magnesium affect yeast?

Answer 7

Necessary component for glycolysis
Maintains structural integrity of the yeast

Question 8

How does zinc affect yeast?

Answer 8

stabilizes cell membranes
Facilitates redox coupling (NAD transfer)
Assists with acetaldehyde > ethanol

Question 9

What is free diffusion?

Answer 9

Ability for elements to freely pass through cell membrane

Question 10

What is facilitated diffusion?

Answer 10

Ability for elements to pass through membrane via permease

Question 11

What is ATPase?

Answer 11

Regulates growth and fermentation by excreting acidity from the cell (keeps ph balanced). 30% of beer acidity is from ATPase

Question 12

Which sugar has the fastest uptake and which diffusion pathway does it take?

Answer 12

Glucose/fructose via facilitated diffusion