A student uses a light microscope to study the cellular structure of yeast (SaccharomycesSaccharomycesSaccharomyces cerevisiaecerevisiaecerevisiae).
The student sets up the microscope using an eyepiece lens with a magnification of ×15 \times 15\,×15 and an objective lens with a magnification of ×45\times 45×45. Calculate the total magnification of this microscope setup.
The student is instructed to produce a scientific line drawing of a single yeast cell under high power. Describe three conventions or guidelines the student must follow to ensure their biological drawing is scientifically accurate.
To study the internal structure of organelles such as mitochondria and ribosomes in detail, the student must switch to a transmission electron microscope (TEM). Give two reasons why a transmission electron microscope provides a much clearer and more detailed image of these small cellular structures compared to a light microscope.
40 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.