A student uses a microscope to observe human cheek cells.
Cheek cells contain mitochondria. What is the main function of mitochondria?
Name one type of human cell that does not contain mitochondria.
Under a high-power microscope, the image length of a single mitochondrion is measured to be 4.2 cm4.2\text{ cm}4.2 cm. The real length of this mitochondrion is 1.5 μm1.5\ \mu\text{m}1.5 μm. Calculate the magnification of the image.
Use the equation:
magnification=size of imagereal size of object \text{magnification} = \frac{\text{size of image}}{\text{real size of object}} magnification=real size of objectsize of imageShow your working.
State two advantages of using an electron microscope instead of a light microscope to study organelles like mitochondria.
163 exam-style questions on AQA GCSE Biology 1.1 Cell structure, covering 1.1.1 Eukaryotes and prokaryotes, 1.1.2 Animal and plant cells, 1.1.3 Cell specialisation, 1.1.4 Cell differentiation, 1.1.5 Microscopy, and 1.1.6 Culturing microorganisms. Each one has a worked solution and a mark scheme showing where the marks go.