1. 7-1 Life is CELLULAR Federoff

3. Discovery of the Cell Microscopes allowed a new world to open up. – Started in the late 1500’s with eyeglass makers Robert Hooke (1665) – Englishman – Studied Cork – Termed cells “cells” because of their resemblance to monastery rooms.

4. Discovery of the Cell (cont.) Anton van Leewenhoek – Same time as Hooke – Documented first LIVING and moving cells we know today as microorganisms

5. Cell Theory Schleiden, Schwann and Virchow – Scientists contributors States that: – All living things are made of cells – Cells are the basic structure and function in all living things – New cells come from existing cells

6. Exploring the cell - Microscopes Light Microscopes – Have an objective and eyepiece (ocular) lens – Compound magnification – LIMITS Detail 1000x magnification Requires a stain Thin specimen for light to pass through

7. Microscopes (cont.) Electron Microscopes – Higher Resolution – Can view DNA and Viruses – Scanning and Transmission – LIMITS Must chemically preserve Needs to be DEAD Need to add false color

8. Scanning

9. Transmission

10. Cell Types Lots of variety in size, shape and function All contain DNA and a cell membrane 2 Types – Eukaryotes – have DNA in a nucleus – Prokaryotes – Do not have a nucleus to contain their DNA

11. Prokaryotes Smaller Simpler Doesn’t separate DNA with a nucleus Unicellular Ex. Bacteria

12. Eukaryotes Larger More complex DNA in nucleus Great variety Unicellular or Multicellular Ex. Your cells