AIM: What is the Cell Theory & How was it developed??

1. Do Now: In one or two complete sentences describe what the following quote tells us about the origin of new life. AIM: What is the Cell Theory & How was it developed?? • Quote: • “Fireflies rise from the morning dew, fish and frogs from a muddy stew, maggot worms from rotting meat and mice shall come from sweat and wheat.”

2. What is Spontaneous Generation? • the belief that living things can come from non-living things. • Was once thought to be true, but is now known to be false! How was it disproved? - the following scientists with their combined experiments proved the theory of spontaneous generation to be false & helped develop the Cell Theory.

3. Who was… Francesco Redi? (1668) • scientist whose experiments proved maggots did not come from rotting meat.

4. Who was…Robert Hooke? (1665) - used a compound microscope to look at cork (from bark of a tree) & he saw empty boxlike structures that he named “cells”.

5. Who was…Antonie van Leewenhooke? (mid 1600’s) • used a simple microscope to look at pond water. • was the first to observe microorganisms in pond water.

6. Who was…Matthias Schleiden? (1830’s) Onion cells Elodea cells Cork cells • studied numerous plant parts under the microscope and declared “ALL PLANTS ARE MADE OF CELLS!”

7. Who was… Theodor Scwhann? (mid 1830’s) • Cheek cells Amphibian Blood • Used a microscope to observe numerous animal tissues and declared “ALL ANIMALS ARE MADE OF CELLS!”

8. Who was… Rudolf Virchow? (Mid 1830’s) - observed living cells dividing and declared “ALL CELLS COME FROM OTHER LIVING CELLS!”

9. These scientists discoveries led to the cell theory… What is the CELL THEORY??? Theory that states… • All organisms are made of one or more cells. • The cell is the basic unit of life which can perform life processes. • All cells come from other living cells.