Living Factories

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Living Factories

Biotechnology

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Saccharomyces cerevisiae

YEAST!!!

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Yeast

Single celled microorganism

Type of fungus

Exist on all living matter

16 chromosomes

Hundreds of different species!

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Did you know?

We may not look much like yeast or they like us, but many of the 6,000 genes in yeast have counterparts in humans!

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Looking at Yeast

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Yeast as a Living Organism

As a living organism, just like us, yeast needs the following to survive and flourish:

-sugars

-water

-warmth

Respiration is the process by which a living organism releases energy from its food

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Do you remember the difference between aerobic and anaerobic respiration?

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Aerobic Respiration

Humans produce energy through aerobic respiration

In aerobic respiration glucose reacts with oxygen in the mitochondria of the cells to release energy.

Carbon dioxide and water are by-products of the reaction.

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Aerobic Respiration

Glucose + oxygen carbon dioxide

+ water + energy

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Anaerobic Respiration

Anaerobic respiration occurs when oxygen is not available.

In anaerobic respiration the glucose is only partially broken down, and lactic acid is produced

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Fermentation

Living yeast cells in the absence of oxygen are still able to use sugar as their source of food to make energy

This is known as fermentation

In this case ethanol (alcohol) is produced instead of lactic acid

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Anaerobic Respiration (Fermentation)

Glucose carbon dioxide

+ ethanol + energy

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Aerobic Vs. Anaerobic Respiration

Aerobic

-oxygen always required

-efficient method of respiration