Which statement describes how electron microscopy increased our understanding of mitochondria?
it showed mitochondria are larger than the nucleus, so they must control the cell
it revealed a folded inner membrane, linking mitochondria to aerobic respiration
it showed mitochondria contain chlorophyll, so they must absorb light energy
it revealed mitochondria are only in plant cells, so they must make glucose
41 exam-style questions on Edexcel GCSE Biology 1.1 Cells and cell structure, covering 1.1.1 Sub-cellular structures and functions, 1.1.2 Specialised cells and their adaptations, and 1.1.3 Microscope technology and cell structures. Each one has a worked solution and a mark scheme showing where the marks go.