3 Cells

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Cell Structure and Function

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3 Cells

  1. 1. Cell Structure and Function Chapter 3
  2. 2. I. B. Cell Theory <ul><li>The cell is the basic living unit of structure and function. </li></ul><ul><ul><li>All organisms are composed of one or more cells. </li></ul></ul><ul><li>All cells come from other cells. </li></ul><ul><li>Took ~200 years to become established. </li></ul>
  3. 3. II. Organelles in: Animal Plant
  4. 4. II. A. Cell Membrane
  5. 5. Cell Membrane <ul><li>Membrane that contains the entire cell. </li></ul><ul><li>Allows material into or out of the cell. </li></ul>
  6. 6. Cytoplasm
  7. 7. Cytoplasm <ul><li>Not always described as an organelle. </li></ul><ul><li>Semi-fluid “filling” that contains the organelles. </li></ul><ul><li>“ Streaming” -- movement of the cytoplasm </li></ul><ul><li>Assists in transport of some materials as well as movement of the organelles. </li></ul>
  8. 8. II. B. Cell Wall
  9. 9. Cell Wall <ul><li>Made primarily of cellulose </li></ul><ul><li>Gives structure and shape to the cell. </li></ul><ul><li>Found in bacteria, plants, fungi, some protists </li></ul>
  10. 10. II. C. Nucleus
  11. 11. Nucleus <ul><li>Membrane enclosed area </li></ul><ul><li>Contains DNA, genetic material. </li></ul><ul><li>Has pores in it. </li></ul>
  12. 12. II. E. Rough ER ( Rough Endoplasmic Reticulum)
  13. 13. Endoplasmic Reticulum <ul><li>Folded membrane in the cytoplasm </li></ul><ul><li>Transports and modifies protein </li></ul>
  14. 14. II. D. Ribosomes <ul><li>In cytoplasm or on ER making it Rough ER. </li></ul><ul><li>Site of Protein Synthesis. </li></ul>
  15. 15. II. E. Smooth ER ( Smooth Endoplasmic Reticulum)
  16. 16. Smooth ER <ul><li>Folded membrane </li></ul><ul><li>without Ribosomes </li></ul><ul><li>Various functions </li></ul><ul><li>Lipid synthesis </li></ul>
  17. 17. II. H. Vesicles/Vacuoles
  18. 18. Vacuole/Vesicle <ul><li>Membrane enclosed storage space </li></ul><ul><li>usually temporary </li></ul>
  19. 19. Central Vacuole
  20. 20. Central Vacuole <ul><li>Found in plants. </li></ul><ul><li>Large storage area. </li></ul><ul><li>Pushes other organelles to the outside of the cell. </li></ul>
  21. 21. II. I. Mitochondria
  22. 22. Mitochondrion Outer Membrane Inner Membrane Ribosomes DNA
  23. 23. Mitochondria <ul><li>Membrane enclosed compartment </li></ul><ul><li>Cell respiration </li></ul><ul><li>Energy release </li></ul><ul><li>Not in bacteria </li></ul>
  24. 24. II. J. Chloroplasts
  25. 25. Chloroplast <ul><li>Double membrane organelle </li></ul><ul><li>green </li></ul><ul><li>Converts sun energy to stored energy in sugars (photosynthesis) </li></ul><ul><li>Found in Plants, some protists </li></ul><ul><li>Has own ribosomes and DNA </li></ul>
  26. 26. Chloroplast Outer Membrane Grana Stroma Ribosomes DNA
  27. 27. II. K. Curious About These 2 <ul><li>Chloroplasts and Mitochondria have DNA and ribosomes of their own. </li></ul><ul><li>Each different from the cell Double membrane </li></ul><ul><li>Present day cyanobacteria have parts similar to grana; these still present in chloroplasts </li></ul>
  28. 28. Endosymbiont Hypothesis <ul><li>Some organelles may have once been living cells on their own. </li></ul><ul><li>Ingested but not digested. </li></ul><ul><li>Cell got benefit from the ingested cell. </li></ul><ul><li>Symbiotic relationship developed. </li></ul>
  29. 29. IV. Cell Organelles - Recap <ul><li> Bacteria Protist Fungi Plant Animal </li></ul><ul><li>C. Wall </li></ul><ul><li>Chloro. </li></ul><ul><li>Mitoch. </li></ul><ul><li>Nucleus </li></ul>

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