Transcript Cells Part 3

Cells III
Cells Part III
Cell Theory
1.
The cell is the smallest
unit of life.
2.
All organisms are made
from one or more cells.
3.
Cells arise from
pre-existing cells.
Schleiden & Schwann
All cells have:
Cell membrane

Surrounds, contains, protects
 Cytoplasm

“Cell gel” fills interior of cell
 Ribosomes

Help make proteins for cells
 DNA

Contains instructions for cell

As you study cell parts:
What does it look like?
 What is its function?
 What other organelles does it work
with?
 How does the structure of this
organelle allow it to do its job?
 Is it in animals? Plants? Both?

Animal Cell
Plant Cells
Plant Cell
Plants have specialized organelles
not found in animal cells:
 Rigid
cell wall: support
 Chloroplasts: capture energy
from sun
 Large vacuole: storage (water,
sugars)
Chloroplast:
Use sunlight to make sugars
Photosynthesis
Chloroplasts
Plant Cell Vacuole:
Stores water and food
Plant Cell Walls:
Support and Protection
A few examples of
specialized cells
from complex organisms
Elodea (400 X) photosynthesize
Dividing Onion Root Tip with
DNA visible as cluster
Neuron
Heart muscle cells beat > 5 billion
times in a lifetime!
Egg cell surrounded by sperm
2-cell embryo - first
division after
fertilization
(This one will become a sea urchin)
Red Blood Cell: specialized to
transport oxygen to other cells
White Blood Cell:
Protects the body from
Invaders
Great sites for cell biology:

www.cellsalive.com

http://learn.genetics.utah.edu/content/be
gin/cells/