IGCSE Biology Extended 21.2.1—Role of anaerobic respiration in yeast Topic Practice

Biotechnology is used in the process of bread-making.
Fig. 1.1 shows some of the steps in making bread.

State the name of two products of biotechnology, other than bread, that make use of microorganisms.

1

2

Some countries have invested in biofuels such as ethanol, biomass and biodiesel.

Describe how ethanol can be made by microorganisms.

Genetic engineering is an example of an important biotechnology.

In addition to genetic engineering, enzymes are also useful in other biotechnologies.

State two examples of how enzymes are used in another biotechnology.
1

2

Yeast carries out anaerobic respiration, making carbon dioxide and ethanol as end-products.
Which end-products can be used to make biofuel and bread?