Download Cell Theory - stephen fleenor

Warm-Up (10/26)
Answer the following questions, and explain in a
complete sentence why each answer is correct.
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
Name
Date
Period
Cell Theory
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
Robert Hooke
• Born: July 18, 1635
• Died: March 3, 1703
• He lived in the United
Kingdom.
• He was an architect,
naturalist, and scientist.
Hooke
• He worked with
microscopes.
• He studied cork a
kind of tree bark.
• He discovered plant
cells in the bark.
Hooke
• 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
Hooke
• His cell discovery
was important
because his findings
led to the scientific
study of cells. (cell
biology)
Anton van Leeuwenhoek
• Born: October 24, 1632
• Died: August 30, 1723
• He is known as the “Father of
Microscopy”
Leeuwenhoek
• Studied pondwater, sour milk,
and semen
• named moving organisms
“animalcules”
Leeuwenhoek’s drawings of
“animalcules” set off a flurry of amateur
and sometimes ridiculous claims, such
as:
- pondwater animalcules causing
madness!
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.
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.
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.
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
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.
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
The Cell Theory
• The cell theory has three parts:
– All living things are .. Made of one or
more cells
• By Schwann and Schleiden
The Cell Theory
• The cell theory has three parts:
– Cells are the... Smallest working unit of
living things
• By Schwann and Schleiden
The Cell Theory
• The cell theory has three parts:
• All cells come from.. Preexisting cells
through cell division
– Virchow
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.
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
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...
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
Closure
Answer the following question in a complete
sentence:
Describe the difference between
Hooke’s and Leeuwenhoek’s
discoveries.
Name
Date
Period
The difference between Hooke’s and
Leeuwenhoek’s discoveries is…
Scale
from 1-10