Metabolism Flashcards

1
Q

What is metabolism?

A

Sum of all enzymatic reactions

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2
Q

What is a catabolic sequence?

A

Degrade, through an oxidative process, simple organic molecules and retain some energy in the form of ATP

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3
Q

What is an anabolic sequence?

A

Consume energy and synthesize, in a reductive process, simple molecules when are assembled into more complex structures

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4
Q

What is reduction coupling?

A

The transferring of electrons via the co-enzyme NAD

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5
Q

What is ATP?

A

Free energy (adenosine tri-phosphate)

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6
Q

What is NAD?

A

A co-enzyme involved in cell redox actions - transfers electrons as NADH and received electrons as NAD+

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7
Q

What is glycolysis?

A

The degradation of sugar with production of energy (ATP) for cell growth

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8
Q

What is pyruvic acid?

A

a three carbon acid formed when glucose is broken down

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9
Q

What is respiration?

A

Uptake of oxygen to generate energy (pyruvate > o2 > co2 + h2o). Must have high o2 and low sugar

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10
Q

What is Crabtree effect?

A

When high sugar levels are present, it will suppress the ability of yeast to respire. Yeast will always choose fermentation over respiration with high sugar levels.

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11
Q

What is a fed batch system?

A

A way to control the amount of sugar being fed to yeast in a propagation system

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12
Q

Why does brewing yeast need a small amount of oxygen at the start of fermentation?

A

Synthesis of sterols and unsaturated fatty acids for strong yeast cell membranes

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