Look at the diagram of a fermenter in the following figure. Explain the reason for the addition of air, containing oxygen to the fermenter.
Important Questions on Biotechnology
Copy and complete these sentences, using the words below. You may use each word once, more than once or not at all.
| amylase | bacterium |
| biofuel | catalase |
| protease | ethanol |
| Bread making | Carbon dioxide |
| oxygen | glucose |
| starch | Sulphur dioxide |
Yeast is a single-celled____. It can respire anaerobically, breaking down glucose to form ____ and the gas _____, _____. To make ethanol for use in _____, yeast is provided with sugars that have come from crops such as maize. To make bread, yeast is mixed with flour and water. The enzyme _____ breaks down starch in the flour, producing _____ that the yeast uses in respiration.This forms _____, ______which makes the bread rise.
Enzymes are used commercially to extract juice from the apple. The diagram below shows two containers of apple juice. One contains juice extracted using an enzyme and the other without an enzyme.
Regarding the diagram, compare the volume and appearance of the two juices extracted.
