Download 11-14-02

Word of the Day
Plasma membrane
Make up day for test or and missing work
is Thursday after school or your lunch.
All tests must be completed by Friday!!
Today
Intro to cells
Project
Discovery of the Cell
Invention of the microscope
seventeenth century
Robert Hooke , Looked at cork
Saw little boxes that reminded him of
cells in a monastery; Coined the word
cell
Anton von Leeuwenhoek observed the
first living cell
Cell Theory
All living thing are composed of one or
more cells
Cells are the basic unit of structure and
function of an organism
Cells only come from other cells
Cell size
Largest cell ostrich yoke
Most cells can only be seen with a
microscope
Cells are limited in size due to there
surface area to volume ratio
Surface area has to be more than the
volume; nutrient are taken in through
the cell membrane
Two types of Cells
Prokaryotic
Simple
No organelles
Usually bacteria
Eukaryotic
Complex
Organelles
Found in
multicellular
organisms