Fungi are important as decomposers helping to release the nutrients in dead and decaying material back into the soil so they can be used by producers. Structure of a yeast cell Yeast consists of single cells. It feeds on sugar. Each cell contains a nucleus and cytoplasm. The cells multiply by a type of asexual reproduction known as budding.
Yeast is used in making wine and other alcoholic drinks, and for making bread.
The process is known as alcoholic fermentation. OH CO H O Beer is made from barley which contains malt sugar. Wine is made from grapes which contain sucrose. Making bread When yeast carries out fermentaion it gives off carbon dioxide. If the dough is left in a warm place for about an hour the yeast will multiply and give off carbon dioxide.