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Cell Structure - PowerPoint PPT Presentation


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Cell Structure. Nucleolus. This is where ribosomes are synthesized. They are a tangle of chromatin. Not membrane bound. Nucleus. Contains the chromosomes. Surrounded by a selectively permiable membrane that contains pores. . Endoplasmic reticulum.

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nucleolus
Nucleolus
  • This is where ribosomes are synthesized.
  • They are a tangle of chromatin. Not membrane bound.
nucleus
Nucleus
  • Contains the chromosomes.
  • Surrounded by a selectively permiablemembrane that contains pores.
endoplasmic reticulum
Endoplasmic reticulum
  • Flattened sacs that traverse the cytoplasm.
  • Two types:
    • Rough E.R.- site of protein synthesis from the attached ribosomes.
    • Smooth E.R.-
      • Assists in the synthesis of steroid hormones and other lipids
      • Connect R.E.R to golgi.
      • Carries out detoxification processes.
ribosomes
Ribosomes
  • The site of protein synthesis.
  • Either in cytoplasm or attached to endoplasmic reticulm.
golgi apparatus
Golgi Apparatus
  • Near the nucleus, it is flattened membranous sacs surrounded by vesicles.
  • They package substances from R.E.R and secrete them to other parts or cell surface for export.
mitochondria
Mitochondria
  • The site of cellular respiration.
  • All cells have them, very active cells have up to 2,500.
  • Have an outer double membrane called cristae.
  • Called the powerhouse of the cell.
  • Have own DNA.
lysosome
Lysosome
  • Sacs of digestive enzymes.
  • They are the main intracellular digestor.
  • They are breaking down and recycling cell parts.
proteins
Proteins
  • Complex Macromolecules that carry out many functions.
  • Examples:
    • Growth and repair
    • Signaling
    • Defense
    • Catalyzing chemical reactions.