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Chapter 7-1 Life is Cellular

Chapter 7-1 Life is Cellular. Early Microscopes. Robert Hooke -1665 looked at a thin slice of cork , from the cork oak tree Coined the term “cells”; looked like the rooms of a monastery (many empty boxes). Anton van Leeuwenhoek. looked at pond water

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Chapter 7-1 Life is Cellular

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  1. Chapter 7-1 Life is Cellular

  2. Early Microscopes • Robert Hooke -1665 • looked at a thin slice of cork, from the cork oak tree • Coined the term “cells”; looked like the rooms of a monastery (many empty boxes)

  3. Anton van Leeuwenhoek • looked at pond water • he was amazed by tiny living organisms

  4. Developing the Cell Theory • Matthias Schleiden- 1838 • Concluded that plants were made of cells

  5. Theodor Schwann • Concluded that animals were made of cells - 1839

  6. Rudolf Virchow - 1858 • Concluded that cells must come from dividing cells

  7. Cell Theory: 1) All living things are composed of cells 2) Cells are the basic units of structure and function in living things 3) New cells are produced from existing cells.

  8. Exploring the cell – Microscopes (what we skipped in Chapter 1) • Name of Instrument: Compound Light Microscopes • Magnify 1500x • (what we’ll use!) • Use a series of lenses to magnify objects in steps. • Today researchers tag molecules with fluorescence and follow their path through the cell.

  9. Find us!! Prokaryotes Eukaryotes

  10. Electron Microscopes – 150,000x magnification • Transmission Electron Microscopes (TEM) – explore cell structures and large proteins • Scanning Electron Microscopes (SEM) – scan of surface of specimen; 3D images

  11. Prokaryotes vs. Eukaryotes • All cells: • Have a plasma membrane • Contain DNA

  12. Two broad categories: Eukaryotes - contain nucleus; “eu” means true Prokaryotes- no nucleus; “pro” means before

  13. Eukaryotes • HAVE NUCLEUS • Larger, more complex • Plants, animals, fungi, and protists

  14. Prokaryotes • NO NUCLEUS • Smaller, simpler • Bacteria

  15. before true DNA Cell membrane Membrane bound organelles Plants, animals, fungi, and protists

  16. Click:Eukaryotic Cell vs. Prokaryotic cell Membrane bound organelles Endosymbiotic Theory No nucleus Nucleus

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