Download What do you know about cells?

Do Now…
Survey
Create
title page in journal
Chemistry Test Reflection
On a note-card answer the following questions
1.
How long did you study for the
Chemistry test?
2.
I think this amount of studying was:
JOURNAL ENTRY

Title Page: Chemistry of
Life

Add title, pictures, etc
that make this page
unique for you

Add this to your journal
Table of Contents
a) just right!
b) probably okay
c) not enough
3.
What method did you use to study?
4.
I think I will score an __________
(grade) on the test.
5.
What are 2 to 3 strategies you will
use to support or improve your
learning for the next unit?
Take Survey
Name: __________________________
Period:_____________
What do you know about cells?
Parts
Cells
What are they?
Different parts of cells
Where are they found?
How small are they
Questions?
Types
Different types of cells
What would you like to learn
about cells?
Group Brainstorm:
What
is true of all living
things? Make a compact,
summarized list in journal.
What
is true about all cells?
Write your thoughts in your
journal.
POD




Get new books
Start new section in
journal
Use book to build
background
knowledge of history
of the cell
Answer some
questions

GOALS



Understand who
contributed to
discovery of the cell
Explain how each type
of microscope
contributed to
knowledge of cells
How has knowledge of
cell impacted our life
today?
How cool are microscopes?

What world have they unleashed?
Magnification: X 500
The long, thin fibers you see here are really elongated cells of the pine tree. The
trees are cut down, chipped up and pounded to separate the fibers from the rest of
the tree material.
Magnification: X 35
At a glance, this stuff appears to stick as if by magic. However, magnified
35 times, it is easy to see where the stick comes from. One side contains
the hooks (left side), the other has the loops that catch on the hooks.
Magnification: X 35
Common everyday items take on a new dimension at high magnification.
In this photo, a staple is seen where it ripped through the fibers of a yellow
sticky note paper.
Magnification: X 1,000
These tiny glass capsules contain a liquid scent and are glued onto paper.
When the paper is scratched, some of the capsules are ruptured and the
scent is released.
Magnification: X 75
The mineral salt has a cubic crystal shape. This grain of kosher salt is
composed of many cubes stuck together. With its large surface area, it can
absorb more moisture than a similar sized cubic salt crystal. This makes it
ideal for curing meats, which involves absorbing blood from the raw meat.
Magnification: X 35
The bristles of this mascara brush are covered with dried mascara and
flakes of skin.
Mold in My Shower
I found this growing in the corner of my shower. It's some kind of mold, which
grows easily in damp places. Mold is a fungus and, with enough moisture, can
grow on just about any kind of organic matter. This one was mostly black; whitish
molds are often called mildew. Many people are finding out they are allergic to
molds and mildews.
Book Preview
Preview the book
 Read first paragraph together
 In your journal –

What would you like to know about cells?
 What do you think you might learn about cells
in this chapter?

The Cell Theory
Some Random Cell Facts
The average human being is composed of
around 100 Trillion individual cells!!!
 It would take as many as 50 cells to cover
the area of a dot on the letter “i”

WOW!!!
Work to do…
Create a flow chart showing how the work
of the following scientists contributed to
scientific understanding of cells
 Briefly explain how each type of
microscope contributed to knowledge of
cells
 Answer questions #1,2,3 on page 13.

Discovery of Cells



1665- English Scientist, Robert Hooke, discovered cells
while looking at a thin slice of cork.
He described the cells as tiny boxes or a honeycomb
He thought that cells only existed in plants and fungi
Anton van Leuwenhoek


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1673- Used a handmade microscope to observe pond
scum & discovered single-celled organisms
He called them “animalcules”
He also observed blood cells from fish, birds, frogs,
dogs, and humans
Therefore, it was known that cells are found in animals
as well as plants
150-200 Year Gap???



Between the Hooke/Leuwenhoek discoveries
and the mid 19th century, very little cell
advancements were made.
This is probably due to the widely accepted,
traditional belief in Spontaneous Generation.
Examples:
-Mice from dirty clothes/corn husks
-Maggots from rotting meat
19th Century Advancement


Much doubt existed around Spontaneous Generation
Conclusively disproved by Louis Pasteur
Pasteur: Ummm, I
don’t think so!!!
?
=
+
Development of Cell Theory


1838- German Botanist, Matthias Schleiden,
concluded that all plant parts are made of cells
1839- German physiologist, Theodor Schwann, who
was a close friend of Schleiden, stated that all
animal tissues are composed of cells.
Development of Cell Theory

1858- Rudolf Virchow, German physician, after
extensive study of cellular pathology, concluded
that cells must arise from preexisting cells.
The Cell Theory Complete

The 3 Basic Components of the Cell Theory
were now complete:

1. All organisms are composed of one or more cells.
(Schleiden & Schwann)(1838-39)
2. The cell is the basic unit of life in all living things.
(Schleiden & Schwann)(1838-39)
3. All cells are produced by the division of
preexisting cells. (Virchow)(1858)


Modern Cell Theory

Modern Cell Theory contains 4 statements, in
addition to the original Cell Theory:

The cell contains hereditary information(DNA) which is
passed on from cell to cell during cell division.
All cells are basically the same in chemical composition
and metabolic activities.
All basic chemical & physiological functions are carried
out inside the cells.(movement, digestion,etc)
Cell activity depends on the activities of sub-cellular
structures within the cell(organelles, nucleus, plasma
membrane)


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How Has The Cell Theory Been Used?

The basic discovered truths about cells, listed in
the Cell Theory, are the basis for things such as:

Disease/Health/Medical Research and Cures(AIDS,
Cancer, Vaccines, Cloning, Stem Cell Research, etc.)
Some Parting Thoughts


It is amazing to think that the cells that make up
our bodies are just as alive as we are. Humans
are just an intricately designed community of
cells, which must work together to survive.
Cells, in my opinion, are one example of true
intricate design in nature
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