Cell Micrographs

Skill:

•  Interpretation of electron micrographs to identify organelles and deduce the function of specialised cells

    
A micrograph is a photo or digital image taken through a microscope to show a magnified image of a specimen

While organelles have identifying structures, specific shapes may vary depending on the location of cross-sections


Prokaryotic Cell Features


   Feature:        none        nucleoid        cell wall        pili        flagella        all


Eukaryotic Cell Features


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Organelles  (click on image to display false colour)


Attempts can be made to deduce cell function based on the relative abundance of various organelles:

  • Mitochondria – Cells with many mitochondria typically undertake energy-consuming processes (e.g. neurons, muscle cells)
  • ER – Cells with extensive ER networks undertake secretory activities (e.g. plasma cells, exocrine gland cells)
  • Lysosomes – Cells rich in lysosomes tend to undertake digestive processes (e.g. phagocytes)
  • Chloroplasts – Cells with chloroplasts undergo photosynthesis (e.g. plant leaf tissue but not root tissue)


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