Nutrition Flashcards

1
Q

What are 3 macro elements required for yeast growth?

A

Carbon
Hydrogen
Oxygen
Nitrogen
Phosphate
Potassium
Sodium
Zinc
Magnesium

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2
Q

What percentage of yeast cell weight is protein?

A

35-65

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3
Q

What percentage of yeast cell weight are polysaccharides?

A

20-40

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4
Q

What are some yeast nutrients found in wort?

A

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

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5
Q

What is the best course for nitrogen in wort?

A

Amino acids (FAN or YAN)

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6
Q

How does calcium affect brewing?

A

Lowers wort ph
Oxalate precipitation
Yeast flocculation
Alpha Amalyse

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7
Q

How does magnesium affect yeast?

A

Necessary component for glycolysis
Maintains structural integrity of the yeast

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8
Q

How does zinc affect yeast?

A

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

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9
Q

What is free diffusion?

A

Ability for elements to freely pass through cell membrane

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10
Q

What is facilitated diffusion?

A

Ability for elements to pass through membrane via permease

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11
Q

What is ATPase?

A

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

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12
Q

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

A

Glucose/fructose via facilitated diffusion

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