CELLS

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CELLS

• ..as units of Life.
• Ch. 7.1 A View of the Cell

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CELLS

• Basic units of
• Structure and
• Function
• of all living things.

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WHAT DO WE MEAN BY

• STRUCTURE ?
• FUNCTION ?

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• STRUCTURE HOW IT IS BUILT/CONSTRUCTED.
• FUNCTION WHAT IT DOES, HOW IT WORKS.

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The Cell Theory

• All organisms are composed of one or more cells
• The cell is the basic unit of organization for
  the organism
• All cells come from pre-exiting cells

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Two basic cell typesProkaryotic Eukayotic

• Prokaryotic cells
• Earliest cells
• Lack membrane bound organelles
• No nucleus
• No mitochondria
• Have membrane, cytoplasm free DNA

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An Organelle Is
A minute structure within a plant or animal cell
that has a particular job or function.
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Prokayrotic cells Bacteria
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Eukaryotic cells

• May have evolved from Prokaryotic
• Have a nucleus that holds the DNA inside a
  membrane
• Have mitochondria
• Also have cell membrane cytoplasm

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What are some differences between animal and
plant cells?
Nucleus
Mitochondria
ANIMAL PLANT
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Human muscle cells With large nuclei
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Eukaryotic Cells are found in animals like
Paramecium
Nucleus With DNA For reproduction
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Mitochondria where energy is released
The power house of the cell
Has a membrane like The nucleus
ATP
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Exception A Eukaryotic Cell With NO NUCLEUS !
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What are some differences between animal and
plant cells?
ANIMAL PLANT
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Organelles found only in Plants
Cell Walls Cellulose Chloroplasts
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Plant Cell

• Chloroplast absorbs light, changes light energy
  into chemical energy for photosynthesis GREEN
• Cell Wall forms rigid outer structure, made of
  cellulose (fiber)
• Cellulose carbohydrate found in cell walls

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Cell wall
Chloroplast
Large vacuole
PLANT CELL
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Plant cells
Both plants protists have chloroplasts cell
walls cellulose
Diatoms
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No Wall, Just a Cell Membrane
Animal Cell
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Organelles found only in Animal cells
Centrioles involved in cell division
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Found in both Plant and Animal Cells
Organelles that surround cells for support
Cytoskeleton gives
structure to a cell Cell Membrane
Semi-permeable, controls what enters and leaves
the cell, outer containment envelope.