A computer program predicts the images produced when different microscopes view simulated pairs of points.
| Microscope | Resolution |
|---|---|
| Light microscope | 200 nm200\ \text{nm}200 nm |
| Transmission electron microscope | 0.2 nm0.2\ \text{nm}0.2 nm |
The program tests four pairs of points.
| Simulated pair | Separation of points |
|---|---|
| P | 0.15 nm0.15\ \text{nm}0.15 nm |
| Q | 20 nm20\ \text{nm}20 nm |
| R | 200 nm200\ \text{nm}200 nm |
| S | 2 μm2\ \mu\text{m}2 μm |
Which simulated pair would appear as a single blurred point with both microscopes?
Pair P, with a separation of 0.15 nm0.15\ \text{nm}0.15 nm
Pair Q, with a separation of 20 nm20\ \text{nm}20 nm
Pair R, with a separation of 200 nm200\ \text{nm}200 nm
Pair S, with a separation of 2 μm2\ \mu\text{m}2 μm
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.