False colour scanning electron micrograph of the unicellular yeast Saccharomyces cerevisiae, or Baker's yeast. Cells with the appearance of pinched in waistlines are in the process of dividing. The circular areas on some of the cells are bud scars where former daughter cells have broken away at the completion of cell division. Yeast, a form of fungus, multiplies rapidly by a process of budding or by fission. They have the ability to ferment sugars and in so doing produce alcohol and carbon dioxide. These properties are used in the production of wines, beers and in the baking of leavened bread. Magnification: x1325 at 35mm size.