Cell Theory

• Cell Theory

  All living things are composed of cells
• Types of cells

  • One-celled: bacteria, protozoa
  • Multicellular: humans
• Cells


  • Within which processes of life occurs
  • When things are done, you can see that the cells are the source (e.g. metabolism, photosynthesis, homeostasis, and cell division)
• Cell


  The basic functional unit of life
• Elements

  Not the fundamental units of life because they can only function together and not individually (they do not support life alone and they make up cells)
• Cells

  Arise only from previously existing cells
• Unicellular organisms

  Worked alone
• Multicellular organisms


  Worked together
• Mitochondria evolution

  1. Swallowed by a larger cell

  2. Integrated with the cell

  3. Became reliant to the host
• Cells carry genetic information in the form of DNA
• 1. All living things are composed of cells
  2. The cell is the basic functional unit of life
  3. Cells arise only from previously existing cells
  4. Cells carry genetic information in the form of DNA