Muscle cells need to release a lot of energy.
Which sub-cellular structure would be found in large numbers in muscle cells?
chloroplasts
ribosomes
plasmids
mitochondria
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.