Cell Structure
& Function
http://koning.ecsu.ctstateu.edu/cell/cell.html
Cell Theory
• All living things are made up of cells.
• Cells are the smallest parts of all living
things.
• All cells come from other cells that divide
to make new ones.
Definition of Cell
A cell is the smallest unit that is
able to do life tasks.
Examples of Cells
One celled organism
Plant Stem
Bacteria
Red Blood Cell
Nerve Cell
Types of Cells We Will
Study
Plant
Animal
Parts of Cells
• Both cells have organelles in them.
• Each organelle has a special job to
do to help the cell function.
• We will only be learning about some
of the organelles.
http://library.thinkquest.org/C004535/eukaryotic_cells.html
“Typical” Plant Cell
http://waynesword.palomar.edu/images/plant3.gif
“Typical” Animal Cell
http://web.jjay.cuny.edu/~acarpi/NSC/images/cell.gif
Cell Parts
(You saw lots of cell parts, called organelles, in the preceding slides.
Don’t worry we will only study the organelles on the following slides.)
Are you ready?
Introducing the
Organelles!
Surrounding the Cell
Cell Membrane
• Outer membrane of cell
that controls movement
of nutrients, water and
gases in and out of the
cell
http://library.thinkquest.org/12413/structures.html
Cell Wall
• In plant cells
• Supports & protects
the cell
http://library.thinkquest.org/12413/structures.html
Inside the Cell
Nucleus
• Directs cell activities
• Contains genetic material - DNA
Chromosomes
• In nucleus
• Made of DNA
• Contain instructions
for traits &
characteristics
http://library.thinkquest.org/12413/structures.html
Cytoplasm
• Gel-like mixture
• All organelles are in the cytoplasm
Mitochondria
• Produces energy – by
chemical reactions that
break down fats &
carbohydrates
http://library.thinkquest.org/12413/structures.html
Vacuoles
• Sacs for storage
• Contains water
• Help plants keep
shape
http://library.thinkquest.org/12413/structures.html
Chloroplast
• In plant cells
• Contains green
chlorophyll
• It is where
photosynthesis takes
place
http://library.thinkquest.org/12413/structures.html