Fermentation

Question 1

Name the two main types of microorganisms?

Answer 1

bacteria and fungi

Question 2

Name 3 products produced using microorganisms

Answer 2

bread, alcohol and yoghurt

Question 3

Why are microorganisms suitable for producing useful substances for humans?

Answer 3

they grow rapidly, have simple nutrient requirements, and can produce a wide variety of products, including food, pharmaceuticals, and industrial chemicals

Question 4

Give an example of a single celled fungi

Answer 4

yeast

Question 5

What is produced during fermentation in plant yeast cells?

Answer 5

ethanol (alcohol) and carbon dioxide

Question 6

Where does fermentation occur in cells?

Answer 6

the cytoplasm

Question 7

What substance builds up in animal cells during fermentation?

Answer 7

lactic acid

Question 8

What is the name for anaerobic respiration in yeast cell?

Answer 8

fermentation

Question 9

Name 2 useful substances made by bacteria carrying out fermentation?

Answer 9

yoghurt and cheese

Question 10

Name 3 useful substances made by yeast carrying out fermentation?

Answer 10

wine, beer and bread

Question 12

What stage in yoghurt production ensures that no unwanted bacteria are present?

Answer 12

The pasteurisation stage

Question 13

How does storage at 5 degrees celcius increase the shelf life of yoghurt?

Answer 13

Slowing down bacterial activity, reducing spoilage, and maintaining quality

Question 14

What causes the flavour of the yoghurt to change after 10 days storage?

Answer 14

The ongoing fermentation of bacteria that increases acidity and alters flavour