A student uses a microscope with a magnification of ×250 \times 250\,×250 to view plant cells. They draw a line A−BA-BA−B representing the length of a single cell on their drawing. The length of line A−BA-BA−B on the paper is measured as 45 mm.
State the length of line A−BA-BA−B in micrometres (μm\mu\text{m}μm), given that 1 mm=1000 μm1\text{ mm} = 1000\ \mu\text{m}1 mm=1000 μm.
Calculate the real length of the cell in micrometres (μm\mu\text{m}μm) using the formula:
real length=length of line A−B (in μm)magnification \text{real length} = \frac{\text{length of line } A-B\text{ (in } \mu\text{m}\text{)}}{\text{magnification}} real length=magnificationlength of line A−B (in μm)163 exam-style questions on AQA GCSE Biology 1.1 Cell structure, covering 1.1.1 Eukaryotes and prokaryotes, 1.1.2 Animal and plant cells, 1.1.3 Cell specialisation, 1.1.4 Cell differentiation, 1.1.5 Microscopy, and 1.1.6 Culturing microorganisms. Each one has a worked solution and a mark scheme showing where the marks go.