slide. The student used an eyepiece graticule to calculate the size of some of the onion cells. Figure 1 shows the student's eyepiece graticule and stage micrometer. The stage micrometer measures in millimetres. Figure 1 0 10 20 30 40 Eyepiece graticule 0 mm 2 Stage micrometer Use Figure 1 to calculate the size of one division on the student's eyepiece graticule, in micrometres. Show your working.

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Microbial Isolation

Isolation of the microorganisms in microbiology is the process of developing a pure culture by separating one species of microbe from a mixture of many other species. A pure culture is a culture that contains only one species of microbe.