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Cells
Why are cells so similar yet very different?
Cells are the building blocks
for life!
• All living organisms are made of at least one cell
• Many = multicellular
• One = Unicellular / single cellular
• All cells come from other living cells
• Prokaryote – a cell that has neither a distinct nucleus
with a membrane nor specialized organelles
• Eukaryote – a cell in which the genetic material (DNA)
is found inside a membrane bound nucleus and has
specialized organelles
Cells are the basic unit of Life
• Cells of the same function group together to form
• Tissue – tissue forms
• Organ – organs form
• Organ systems – which work together to form
• An organism!!!!
What determines the structure of
a cell?
• It’s function in the organism
Cross section of a leaf.
Corn root tip.
Leaf cells
A magnified leaf cell.
A nerve cell (neuron)
Cells in the villi of the small
intestine
Liver cells.
Red blood cells
Red
blood
cells
loose
their
nucleus
to make
more
room for
oxygen
“Sickle” red blood cells vs.
“normal red blood cells
Blood smear with white blood
cells
A single celled organismParamecium
Paramecium having eaten red
dyed yeast.
An amoeba, another single
celled organism. One cell has
to do it all!
Photosynthetic algae
Frog embryo
Neural
Tube will
become
brain and
spinal
cord
A dissected rat… Just
because
Human egg cell and sperm cell
An early human embryo- “just
a ball of stem cells”