Biology biotechnology
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What is biotechnology?
The use of biological processes organisms to create useful products
What is yeast?
Microorganism
What is yeast used for?
Production of bread and many alcoholic drinks, these products are made by fermentation
How does fermentation help yeast?
Fermentation is a anaerobic respiration so the yeast respires without needing oxygen
How do enzymes help the yeast?
Enzymes in the yeast speed up the process of fermentation so speeding up the reaction
Where do enzymes work best?
Warm environments
How do you make bread?
Flour, water and yeast are mixed to make dough Dough is left in a warm place to rise Yeast expires, changing the sugars in the flour into ethanol ad carbon dioxide The carbon dioxide gas is trapped as the bubbles inside the dough, making it rise The dough is baked so in the oven, the ethanol evaporates and the bubbles of gas expand, making the bread rise further
How do you make wine?
Wine is made when yeast is used to ferment grape sugar
How do you make beer?
Yeast is used to ferment sugar into malted barley, it is known as brewing
What is the process of making alcoholic drinks?
Plant sugar is added to a large container, often the plant needs to be crushed Yeast is added to ferment the sugar into alcohol The container is sealed to keep out oxygen and other microorganisms The mixture is left until the sugar has fermented into alcohol Sediment is removed rom the liquid by filtration The liquid is bottled or put into barrels