Week 13, Day One
HW # 43- Compare the L (in your KWL) to what is said on
pgs. 84 & 85 of your text. Add any additional
information that you feel is important.
Perform your Cell Theory Rap for a
friend/parent/sibling/pet.
Warm up
(collect last week’s warm up & parent letter)
Where do cells come from? How do you know?
Warm up Response
Homework Response/Check
Did you complete your Fiber Identification lab
conclusion? If not, put it in your Panther
Planner to complete.
• Cell Theory
KWL
Hairy T-cell
Definition
There are 3 parts to cell theory.
1. All living things are made of cells.
Part 2 of the Theory
2. The cell is the basic structural and functional
unit of life.
Part 3 of the Theory
3. All cells come from pre-existing cells.
yeast cells dividing
Who came up with this theory?
1. Schleiden (circa 1838)
All plants are
made of cells!
Onion skin cells
Who came up with this theory?
2. Schwann
All animals are
made of cells!
Human red blood cells
Who came up with this theory?
3. Virchow
All cells come
from preexisting cells!
How big are cells?
• Microscopic
(mostly)
• Measured in
microns µm
• (micrometers).
• A µm is one
millionth of a
meter =
• 10-9 m = one
thousandth of 1
mm.
How big are cells?
Smallest free-living cell =
Mycoplasma genitalium
Size = 0.2 to 0.3 µm
How big are cells?
• Bacteria e.g. Eschericia coli (aka E.coli)
• Size=1 µm by 3 µm
How big are cells?
• Human red blood cell = 8 µm in diameter
How big are cells?
• Largest cell on
the human body
=
ovum
• Size=
• 1000 µm in
diameter
(1 mm)
How big are cells?
• Smallest cell in the human body =
sperm cell.
How big are cells?
• Largest cell with a
metabolism =
Chaos chaos
Size=1-5 mm in
length.
common name =
Giant Amoeba
Chaos diffluens, is an amoeba closely related to the giant amoebae
How big are cells?
• Largest cell = yolk of an ostrich egg
Ostrich, egg, humans
Ostrich emerged from egg
How can we study cells?
Problem:
They are microscopic!
Solution:
Use a microscope!
Types of Microscopes
1. Compound light
microscope
– Light passes through
lenses to magnify
image up to 1000X
– Can observe living
cells
Types of Microscopes
2. Electron microscope
– Uses a beam of
electrons to
magnify image
> 1000X
– Kills cells being
observed
Cell Theory Rap
http://www.youtube.com/watch?v=wiZFCMrx4Kg&noredirect=1
Common features of all cells
Small size – allows materials to move via
diffusion
• Diffusion = process by which molecules move
from levels of high concentration to levels of
low concentration until equilibrium is
reached
Diffusion
• Google Image Result for
http://www.indiana.edu/~phys215/lecture/lec
notes/lecgraphics/diffusion.gif
Common features of all cells
1. Cell Membrane –
selectively/differentially permeable
(lets some things in and out)
Common features of all cells
2. Cytoplasm – semi-fluid material in
which cell organelles float
Common features of all cells
3. Nucleic acid containing
genetic code :
Which nucleic acid?
DNA
Common features of all cells
4. Cytoskeleton –
proteins that
support the cell
(Microtubules &
microfilaments)
Common features of all cells
5. Ribosomes
– make
proteins
If Cells could be really big ……
Star Trek - The Immunity Syndrome
Bibliography
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http://www.hotlinecancer.com/?cat=28
http://news.bbc.co.uk/1/hi/sci/tech/4636121.stm
http://www.thebacteriabusters.com/eColi.html
http://www.lungcancer.co.uk/how.htm
http://www.fi.edu/learn/heart/blood/red.html
http://biology.about.com/library/weekly/aa091400a.htm
http://www.pbs.org/wgbh/amex/babies/peopleevents/e_ovum.html
http://www.dkimages.com/discover/Home/Animals/Birds/Growth-andDevelopment/Ostrich/Ostrich/Ostrich-15.html
http://www.flickr.com/photos/71751551@N00/1262329163/
http://commons.wikimedia.org/wiki/Image:Ostrich_egg.jpg
http://www.mambalam.net/slideshow.php?set_albumName=Animalia
http://strangebenevolent.blogspot.com/2007/07/meerkats-and-ostriches.html
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www.madsci.org/posts/archives/dec97/878139903.Cb.r.html
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http://en.wikipedia.org/wiki/Amoeba_proteus
http://en.wikipedia.org/wiki/The_Immunity_Syndrome_(Star_Trek
Bibliography
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http://www.pacpress.com/level3/micron.htm
Google Image Result for http://www.indiana.edu/~phys215/lecture/lecnotes/lecgraphics/diffusion.gif
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http://commons.wikimedia.org/wiki/Image:Diffusion.jpg
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http://library.thinkquest.org/C004535/cell_membranes.html
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http://sun.menloschool.org/~cweaver/cells/e/ribosomes/
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http://www.elmhurst.edu/~chm/vchembook/580DNA.html
http://sciencecity.oupchina.com.hk/biology/student/glossary/cytoplasm.asp
http://www.uic.edu/classes/bios/bios100/lecturesf04am/lect06.htm