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CELLS!
                 Structure, Function and Origin




Wednesday, October 21, 2009
Assessing prior knowledge:




                              What is a CELL?



Wednesday, October 21, 2009
In this activity you will be viewing 12
           different cells. Complete the following in your
           science notebook:

           1. Sketch 1 cell from each of the 12 slides.

           2. List any notable structural features of
           each cell (What does it look like?)

           3. Infer about the function of each cell
           (What does it do?)



Wednesday, October 21, 2009
Wednesday, October 21, 2009
Example:
           1. Sketch 1 cell.
           2. Structure - These cells are circular and
           “donut-shaped”. They do not appear to be
           connected and they look smooth on the
           surface. They are also red.
           3. Function - These cells could possibly be
           carriers of hemoglobin within the
           bloodstream.
Wednesday, October 21, 2009
Wednesday, October 21, 2009
Wednesday, October 21, 2009
Wednesday, October 21, 2009
Wednesday, October 21, 2009
Wednesday, October 21, 2009
Halftime!!!
           Take a deep        breath and stretch!




Wednesday, October 21, 2009
Wednesday, October 21, 2009
Wednesday, October 21, 2009
Wednesday, October 21, 2009
Wednesday, October 21, 2009
Wednesday, October 21, 2009
Wednesday, October 21, 2009
The END!!!
           Take a moment to discuss each cell
           and how their structure is related
           to their function.




Wednesday, October 21, 2009
Origin


                      Where do CELLS come
                      from?



Wednesday, October 21, 2009
The “Cell Theory” tells us that “cells
           come from preexisting cells”.




Wednesday, October 21, 2009
CELLS will usually originate as a
           zygote or a stem cell (a cell that
           doesn’t have a job yet).




Wednesday, October 21, 2009
The zygote/stem cell will become
           specialized in structure and
           function through a process
           called differentiation.



Wednesday, October 21, 2009
This differentiation is the result
           of changes in gene expression
           not changes in the DNA code.




Wednesday, October 21, 2009

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Cell Structure And Function