yeast in food production Flashcards

5.5

You may prefer our related Brainscape-certified flashcards:
1
Q

what is yeast?

A

a single celled fungus that can carry out both aerobic and anaerobic respiration

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

what does yeast produce when it carries out anaerobic respiration?

A

alcohol (ethanol) and carbon dioxide

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

when will yeast respire anaerobically?

A

if it has access to plenty of sugar, even if oxygen is available

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

what is yeast mixed with in bread production?

A

flour and water

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

what does the yeast produce?

A

enzymes that break down the starch in the flour, releasing sugars that can then be used by the yeast in anaerobic respiration

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

what happens to the carbon dioxide produced by the yeast during anaerobic respiration?

A

it is trapped in small air-pockets in the dough, causing the dough to rise (expand in volume)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

what is the dough baked in?

A

a hot oven to form bread

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

formula for anaerobic respiration in yeast?

A

glucose -> ethanol + carbon dioxide
C6H1206 -> 2C2H5OH + 2CO2

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

what does the high temperatures used in bread making mean?

A

means that the ethanol does not remain in the bread after cooking has finished- it has evaporated

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

what type of product is the ethanol formed in anaerobic respiration?

A

a waste product

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

what happens to the yeast during baking?

A

it is killed by the high temperatures- ensures there is no further respiration by the yeast

How well did you know this?
1
Not at all
2
3
4
5
Perfectly