Cell Structures (Edexcel IGCSE Biology: Double Science)

• Cells are separated from their surrounding environment by a cell membrane
• Within the cell membrane is the cytoplasm
• Eukaryotic cells have organelles contained within their cytoplasm
  
  • Organelles are subcellular compartments where specific processes take place within the cell
• Within the cytoplasm of eukaryotic cells the following organelles are present
  • Nucleus
  • Mitochondria (singular mitochondrion)
  • Ribosomes
• Plant cells contain the following additional structures 
  • Cell wall
  • Chloroplasts
  • Permanent vacuole

When viewed under a microscope the structures inside a plant cell are visible. Ribosomes and mitochondria are too small to view under a light microscope but are visible with the higher resolution of an electron microscope.