1. Warm-Up (10/26)
Answer the following questions, and explain in a complete sentence why each answer is correct.
Name
Date
Period
Which of the following questions about a flower can be most readily answered by scientific methods?
A. Would this kind of flower make a good gift?
B. What kind of flower is the most beautiful?
C. How pretty is the flower?
D. What kinds of pollinators are attracted to this flower?
By what process is the carbon in fossil fuels released into the atmosphere?
 A. combustion
B. decomposition
C. erosion
D. respiration

2. Cell Theory

3. History
Cells were unknown until the discovery of microscopes in the 1650’s
two scientists working independently built the first microscopes
Anton von Leeuwenhoek in Holland
Robert Hooke in England

4. Robert Hooke Born: July 18, 1635 Died: March 3, 1703
Who
Born: July 18, 1635
Died: March 3, 1703
He lived in the United Kingdom.
He was an architect, naturalist, and scientist.

5. Hooke He worked with microscopes. He studied cork a kind of tree bark.
What
He worked with microscopes.
He studied cork a kind of tree bark.
He discovered plant cells in the bark.

6. Hooke
How
While looking at a piece of cork under the microscope, he saw tiny pores or small compartments.
He named the structures he saw “cells” because they reminded him of the small rooms monks slept in.

8. Hooke
Why
His cell discovery was important because his findings led to the scientific study of cells. (cell biology)

9. Anton van Leeuwenhoek Born: October 24, 1632 Died: August 30, 1723
He is known as the “Father of Microscopy”

10. Leeuwenhoek Studied pondwater, sour milk, and semen
named moving organisms “animalcules”

11. Leeuwenhoek’s drawings of “animalcules” set off a flurry of amateur and sometimes ridiculous claims, such as:
- pondwater animalcules causing madness!

12. Matthais Schleiden Born: April 5, 1804 Died: June 23, 1881
German botanist
Discovered that all plants were made of cells
Contributed to the creation of the cell theory.

13. Easy Question of the day…
You are going to share your answer with the person next to you.
Where do babies come from?
It seems so simple, but it wasn’t always.

14. What they used to think. Human sperm cells contain tiny human beings!
Today we can look back and think “crazy,” but at the time people took these ideas very seriously.

15. Theodor Schwann Born: December 7, 1810 Died: January 11, 1882
German zoologist
Concluded that all animals are made of cells.
Contributed to the creation of the cell theory.

16. Rudolph Virchow Born: October 13, 1821 Died: September 5, 1902
German pathologist
He is known as the “Father of Pathology”
Discovered that all living cells come only from other living cells.

17. The Cell Theory The cell theory has three parts:
All living things are .. Made of one or more cells
Cells are the... Smallest working unit of living things
All cells come from.. Preexisting cells through cell division

18. The Cell Theory The cell theory has three parts:
All living things are .. Made of one or more cells
By Schwann and Schleiden

19. The Cell Theory The cell theory has three parts:
Cells are the... Smallest working unit of living things
By Schwann and Schleiden

20. The Cell Theory The cell theory has three parts:
All cells come from.. Preexisting cells through cell division
Virchow

21. Before the cell theory: Spontaneous Generation
From pre-historic times to about 1850, most people believed that under the right conditions, living things could spontaneously appear from non-living material.

22. People throughout the Middle Ages believed that mice could be “created” spontaneously by putting grain in dark, quiet place and leaving it for a few weeks.
BILL NYE 3 min

23. Finally...
in the late 1870’s, doctors start to wash their hands and instruments before operating...some even start wearing gloves!
Joseph Lister’s wacky idea that antiseptics kill germs catches on...

24. The cell theory is one of the most important theories in biology.
All living things contain at least one cell
Cells are the smallest living units of matter
Cells can only come from pre-existing cells

25. Closure Answer the following question in a complete sentence:
Name
Date
Period
Describe the difference between Hooke’s and Leeuwenhoek’s discoveries.
The difference between Hooke’s and Leeuwenhoek’s discoveries is…
Scale from 1-10