Microbes and Food

Question 1

What type of respiration occurs when oxygen is in short supply?

Answer 1

anearobic respiration

Question 2

What waste chemical is produced in anaerobic respiration in animals?

Answer 2

lactic acid

Question 3

The build up of which acid causes fatigue in vigorously exercising muscle?

Answer 3

yeast

Question 4

Name the organism that is usually used to produce ethanol from plant material.

Answer 4

yeast

Question 5

What is the scientific name for the process in which milk or beer is heated to kill any harmful microorganisms?

Answer 5

Pasteurizing

Question 6

What is the name of respiration that occurs in the absence of oxygen?

Answer 6

anaerobic respiration

Question 7

Look at the picture below. In this experiment what sugar is used?

Answer 7

Glucose

Question 8

Ethanol can be produced using yeast. What is this process called?

Answer 8

Fermentation

Question 9

What substance, apart from yeast, is needed to make ethanol by fermentation?

Answer 9

sugar

Question 10

How does anaerobic respiration work?

Answer 10

Anaerobic respiration occurs in the absence of oxygen. Glucose is broken down and lactic acid is produced. A build-up of lactic acid can cause cramps and muscle fatigue.

Question 11

The word equation for the production of ethanol is shown below. Which letter represents yeast?

Answer 11

Letter B represents yeast. Yeast is a single-celled fungus that can be used to produce ethanol from plant products.