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Cells:
The Basic Units of Life
How big is a cell?
• http://www.cellsalive.com/howbig.htm
The Cell Theory
1. All organisms are made of cells.
2. The cell is the basic unit of life in all
living things.
3. All cells come from existing cells.
THIS IS IMPORTANT BECAUSE IT SHOWS THAT
ALL LIVING THINGS SHARE A SIMILAR
STRUCTURE
Two Types of Cells
All cells, whether they are prokaryotic or eukaryotic, have
some common features
Organelles
Organelles are structures that enable
the cell to live, grow and reproduce.
Two Types of Cells
Prokaryotic Cells:
• Have no membrane
covered nucleus
• Have no membrane
- covered organelles
• Have circular DNA
• Are bacteria
Two Types of Cells
Eukaryotic Cells:
• Have a nucleus
• Have a membrane -
covered organelles
• Have linear DNA
• Are all other cells
Organelles
Organelles are structures that enable
the cell to live, grow and reproduce.
Cell Membrane
• Outer layer of cell
• Allows nutrients
into the cell and
wastes outside of
the cell
Cell Membrane
“Gate into the
city”
Cytoplasm
• Cytoplasm a
jelly-like fluid
contained in
the cell that
holds the
organelles.
The Nucleus
• The control
center of the
cell
• Contains the
Cell’s DNA
DNA
Nuclear Membrane
Nucleolus
“Mayor’s office”
Mitochondria
• Power center of
cell
• Provides the
energy the cell
needs to move,
divide, etc.
Outer Membrane
Inner Membrane
“Electric company of
the cell”
Ribosomes
• Site where
proteins are
made
• Cell parts are
made of
proteins “Factories of the
cell”
Endoplasmic Reticulum
• Transportation
system of cell
• Rough ER-
ribosome's
attached
• Smooth ER- no
ribosome'sRibosomes
Endoplasmic Reticulum
“Roadways of the cell”
Golgi Complex
• Packaging house of
cell
• Packages,
processes, and
ships out the
stuff the cell
makes
“UPS of the cell”
Lysosomes
• Digests food
particles and cell
parts
– “Garbage men”
• Protects cell by
digesting foreign
invaders
– “Police men
Vacuole
• Stores water,
food & wastesVacuole
Vacuole is largest
organelle in plant
cell
Cell Wall
• Found only in
plant cells
• Protects and
supports the cell
Chloroplasts
• Found only in plant
cells
• Contains
chlorophyll (makes
plants green)
• Where
photosynthesis
takes place
Plant or Animal Cell?
Found in Plant and Animal cells: Found only in Plant Cells:
• Nucleus
• Golgi Complex
• Mitochondrion
• Lyosomes
• Endoplasmic
Reticulum
• Cell Membrane
• Ribosomes
• Vacuoles
• Chloroplasts
• Cell Wall

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Cell parts 09 0 (2)