Chlorella is a genus of single-celled green algae.
Name two sub-cellular structures a Chlorella cell has in common with an animal cell.
....................................................................................................
....................................................................................................
Explain why Chlorella is not classified as an animal.
....................................................................................................
An image of Chlorella cells is taken using a microscope.
The actual diameter of a Chlorella cell is 4.8 μm4.8 \ \mu\text{m}4.8 μm. In the printed image, the diameter of this cell measures 35 mm35\text{ mm}35 mm.
(1 mm=1000 μm1\text{ mm} = 1000\ \mu\text{m}1 mm=1000 μm)
Calculate the magnification of the image. Give your answer to 3 significant figures.
Magnification = ....................................................................
Chlorella cells can carry out photosynthesis. Which gas is produced during this process?
....................................................................................................
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.