A mitochondrion is 1.5 μm1.5\ \mu\text{m}1.5 μm long. In an electron micrograph, the image of the mitochondrion is 4.5 cm long.
What is the magnification of the electron micrograph?
×3.0×101\times 3.0 \times 10^{1}×3.0×101
×3.0×103\times 3.0 \times 10^{3}×3.0×103
×3.0×104\times 3.0 \times 10^{4}×3.0×104
×3.0×107\times 3.0 \times 10^{7}×3.0×107
130 exam-style questions on OCR GCSE Biology 1.1 Cell structures, covering 1.1.1 Viewing cells with light microscopes, 1.1.2 Sub-cellular structures and functions, and 1.1.3 Electron microscopy and resolution. Each one has a worked solution and a mark scheme showing where the marks go.