The Cell

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The Cell

  1. 2. Cells
  2. 3. Cells <ul><li>All living things are made of cells </li></ul><ul><li>All cells come from preexisting cells </li></ul><ul><li>Cells are the basic structural and functional unit of life (Cell Theory) </li></ul>
  3. 4. Structure and Function <ul><li>A cell’s structure (shape and size) is directly related to its function </li></ul><ul><li>Skin cells are “plate like” </li></ul><ul><li>Nerve cells are long and branchy </li></ul>
  4. 5. Cell Size <ul><li>Cells are relatively small because they must maintain a high surface area (cell membrane) to volume (cytoplasm) ratio </li></ul><ul><li>If a cell gets too large it will STARVE </li></ul>
  5. 6. Prokaryotes <ul><li>Prokaryotes are organisms whose cells lack a “true” nucleus </li></ul><ul><li>These cells are usually small and simple </li></ul><ul><li>Example: Bacteria </li></ul>
  6. 7. Eukaryotes <ul><li>Eukaryotes are organisms whose cells contain a “true” nucleus </li></ul><ul><li>These cells are usually large and complex </li></ul><ul><li>Examples: Plants, Animals, Fungi, Protists </li></ul>
  7. 8. Plant vs. Animal Cells <ul><li>Plant cells have: </li></ul><ul><ul><li>A Cell Wall (used for structure) </li></ul></ul><ul><ul><li>A Central Vacuole (used to maintain turgor pressure) </li></ul></ul><ul><ul><li>And Chloroplasts (needed for photosynthesis) </li></ul></ul>
  8. 9. Pulse Check <ul><li>Now that you know so much about cells, try your hand at illustrating each of the following types of cells: </li></ul><ul><ul><li>Prokaryotic </li></ul></ul><ul><ul><li>Eukaryotic: Animal and Plant </li></ul></ul>

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