Scientists first used light microscopes to look at cells. Many years later, the transmission electron microscope was invented.
State what is meant by the resolution of a microscope.
A ribosome is about 25 nm25\ \text{nm}25 nm wide. The resolution of a light microscope is about 200 nm200\ \text{nm}200 nm.
Explain why ribosomes cannot be seen using a light microscope.
Give one disadvantage of using a transmission electron microscope.
Explain how the transmission electron microscope has increased our understanding of sub-cellular structures.
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.