Bread making using yeast: IGCSE EDEXCEL BIOLOGY

What are the ingredients needed to make bread.

______ , _____ , ______ and a little bit of _____

Which microorganism is involved in bread making?

Enzymes in yeast break down c_____ in f____ to release s_____

The sugars released from the flour by the enzymes in yeast are used by the yeast to carry out

• Aerobic respiration

• Anaerobic respiration

• Fermentation

The sugars released from the flour by the enzymes in yeast are used by the yeast to carry out

When oxygen runs out the yeast will switch from aerobic respiration to _____ ______ which is also known as ______

When the yeast begins to respire anaerobically what two products are produces?

• Lactic acid

• Water

• Carbon dioxide

• Ethanol

Does the ethanol remain once the dough is baked and turns into bread?

• Yes

• No

What happens to the ethanol as the dough is baked in the oven.

It _____

After the dough reaches a certain temperature in the oven, what happens to the yeast?

It is _____