B3

B3 stuff

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  • Created by: Felicity
  • Created on: 06-05-11 13:29

Yest.

Yeast is one of the oraganisms most useful to people.

When the have plenty of oxygen yest cells respire AEROBICALLY. - Break down sugar to provide energy for the cells. - Produce water and carbon dioxide.

When yeast break down sugar in the absence of oygen they repsire ANAEROBICALLY and produce ethanol and carbon dioxide. Anaerobic respiration of yeast is somethimes called fermemntaion.

 

Bread

Beer

Wine

Yoghurt

Microorganism

Yeast

Yeast

Yeast

Bacteria

Sugar Supply

Sugar added to flour

Starch in barley broken down into sugar (malting)

Grapes

Milk sugar (LACTOSE)

Result

Carbon dioxide makes bread rise

Alcohol – hopes add flavour

Alcohol – flavour depends on grapes

Lactic acid clots and thickens milk.

1 of 2

Bacteria

Far more simple than Yeast. Doesn't respire.

 

Bread

Beer

Wine

Yoghurt

Microorganism

Yeast

Yeast

Yeast

Bacteria

Sugar Supply

Sugar added to flour

Starch in barley broken down into sugar (malting)

Grapes

Milk sugar (LACTOSE)

Result

Carbon dioxide makes bread rise

Alcohol – hopes add flavour

Alcohol – flavour depends on grapes

Lactic acid clots and thickens milk.

2 of 2

Comments

Siobhan

Um... You may be confused- all living things respire?

Ellen Claytor


YEAST*

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