1 / 15

Exploring Cell Theory and Membrane Structure: Foundations of Life Sciences

Cell Theory, established in the 17th century, was significantly influenced by Robert Hooke's first observation of cork cells in 1665, alongside Antonie van Leeuwenhoek's discovery of living cells in 1674. This theory asserts that all living organisms comprise cells, which arise from pre-existing cells, as later supported by researchers like Schleiden, Schwann, and Virchow. The cell membrane, or plasma membrane, plays a crucial role in maintaining homeostasis, featuring a selectively permeable lipid bilayer. These foundational insights underpin our understanding of biology and cellular organization.

jontae
Download Presentation

Exploring Cell Theory and Membrane Structure: Foundations of Life Sciences

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Theory and Membrane The Cell

  2. Cell Theory • First recorded view by Robert Hooke in 1665 • Cork structures look like monks' cells

  3. Cell Theory • First recorded view by Robert Hooke in 1665 • Antonie van Leeuwenhoek viewed living cells in 1674 • Named moving objects in pond water animalcules (little animals)‏

  4. Cell Theory • First recorded view by Robert Hooke in 1665 • Antonie van Leeuwenhoek viewed living cells in 1674 • Henri Dutrochet—1837 • “The cell is the fundamental element of organization.”

  5. Cell Theory • First recorded view by Robert Hooke in 1665 • Antonie van Leeuwenhoek viewed living cells in 1674 • Henri Dutrochet—1837 • Matthias Schleiden—1837 • All plants are composed of cells that come from other plant cells

  6. Cell Theory • First recorded view by Robert Hooke in 1665 • Antonie van Leeuwenhoek viewed living cells in 1674 • Henri Dutrochet—1837 • Matthias Schleiden—1837 • Theodor Schwann—1838 • Animals have cells and those come from other animal cells

  7. Cell Theory • First recorded view by Robert Hooke in 1665 • Antonie van Leeuwenhoek viewed living cells in 1674 • Henri Dutrochet—1837 • Matthias Schleiden—1837 • Theodor Schwann—1838 • Rudolf Virchow—1858 • Cells come from pre-existing cells (refutes spontaneous generation)‏

  8. All Cells • Cell membrane

  9. All Cells • Cell membrane • Cytoplasm

  10. All Cells • Cell membrane • Cytoplasm • Usually live in fluid environment

  11. Plasma Membrane • Also called cell membrane • Controls what goes into and comes out of cell • Selectively permeable

  12. Plasma Membrane • Lipid bilayer made of phospholipids • Phosphate portion is attracted to water, while tails of fatty acid are repelled by water

  13. Plasma Membrane • Proteins extend through structure to enable transport • Glycolipids and cholesterols help maintain shape and function

  14. Fluid Mosaic Model • Proposed by S. J. Singer and Garth Nicolson • Proteins are free to move around in fluid phospholipid layer

  15. Other Membranes • Internal cell structures (organelles)‏ • Membrane composition and structure differs slightly for organelles • Function depends on structure

More Related