Examine the micrograph of the yeast cells. the scale bar under the photo is labeled 1μm. the scale bar works the same way as a scale on a map, where, for example, 1 inch equals 1 mile. in this case the bar represents a much smaller distance. using the scale bar as a basic unit, determine the diameter of the mature parent cell and the new cell. start by measuring the scale bar and then each cell diameter. the units are irrelevant, but working in millimeters is convenient. divide each diameter by the length of the scale bar and then multiply by the scale bar’s label to give you the diameter in μm.