ER

• Rough Endoplasmic Reticulum

  Contains ribosomes to provide a large surface area for protein synthesis and synthesis of glycoproteins,

  Provides a pathway for the transport of materials (especially proteins) throughout the cell.
• Smooth Endoplasmic Reticulum


  Has no ribosomes, is more 'tubular'

  It synthesises, stores and transports lipids and carbohydrates
• Ribosomes

  Made up of ribosomal RNA (rRNA)

  Cytoplasmic granules (can be free in the cytoplasm) or attached to rough ER

  Two types: 70s (prokaryotic), 80s (eukaryotic)
• ER DIAGRAM