1. The Cell
9/4/09

2. Cont’d From Yesterday Units of Small Measurement
Micrometer (µm )
Scientific Notation is written as 1×10−6 m
Nanometer (nm)
Scientific Notation is written as 1×10−9 m
Angstrom (Å or A)
Scientific Notation is written as 1×10−10 m

3. The Cell Theory Produced by Schleidon, Schwann, and Virchow
All living things are made of one or more cells
Cells are the basic units of structure and function in organisms
All cells arise from existing cells

4. Cells must be small Average cell size = 5-20 µm
Surface area to volume ratio must be high
Therefore, substances don’t need to travel as far to reach the center of the cell
(Basketball vs. Tennis ball)

5. Basics of All Cells
Cell membrane- encloses the cell and regulates what goes in and out.
Cytoplasm- the interior of the cell
Cytoskeleton- micro-fibers inside the cytoplasm
Ribosomes- make proteins
DNA- provides instruction for making proteins, regulates cellular activity, and enables cells to reproduce

6. Two types of cells
Prokaryotes
Eukaryotes

7. Prokaryotes Single-celled Lacks a Nucleus and Organelles
Has a Cell wall
Ex: Bacteria

8. Eukaryotes
Has a Nucleus
Has Organelles
Ex: Animal cell,
Human cells

9. Cell Movement
Flagella
Cilia

10. We Have Cilia in Us

11. The Cell Membrane Selectively Permeable Phospholipid bilayer
What does that mean?
Phospholipid bilayer
That’s a big name, lets break it down…
A Phosphate Head and Two Fatty Acid Tails
Bilayer means two layers

12. Movement In and Out Proteins stuck inside the Membrane.
Proteins are made out of what that allows them to stay inside the cell membrane?
Transport Proteins help move substances In and Out of the cell

13. Membrane Game