The Cell Theory Hairy T-cell Definition = Three part theory about cells 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 pre-existing cells! How big are cells?
Microscopic (mostly) Measured in microns m (micrometers). A m 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 m How big are cells? Bacteria e.g. Eschericia coli (aka E.coli) Size=1 m by 3 m How big are cells? Human red blood cell = 8 m in diameter
How big are cells? Largest cell on the human body = ovum Size= 1000 m 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
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.indian a.edu/~phys215/lecture/lecnotes/lecgraphi cs/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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